Intermittent fault - Router crash (now not so intermittent)

[#1]

Hi all,
Was just wondering if anyone could throw a little lite on my problem.
I reported an issue to PlusNet regarding ADSL drop outs. I did the online line check, no issue found.
My speed was dropped to 1meg at this point
I was then advised to contact BT to test the physical line. Sure enough they came out and re-terminated all the connections.
My speed was then increased to 4meg. (And has stayed there)
The problem happens intermitently, I can surf, game  or whatever for hours and then bang, the router locks up.
If i monitor the log screen prior to the lockuk up I see the following.
Statistics
Collected for 5:19:15
Since Reset Current 24-Hour Interval Current 15-Minute Interval Time Since Last Event
ATM Cell Header Errors: 2 2 0 1:40:23
ATM Loss of Cell Delineation: 0 0 0 0:00:00
DSL Link Retrains: 0 0 0 0:00:00
DSL Training Errors: 0 0 0 0:00:00
DSL Training Timeouts: 0 0 0 0:00:00
DSL Loss of Framing Failures: 0 0 0 0:00:00
DSL Loss of Signal Failures: 0 0 0 0:00:00
DSL Loss of Power Failures: 0 0 0 0:00:00
DSL Loss of Margin Failures: 0 0 0 0:00:00
DSL Cumulative Errored Seconds: 6022 6022 256 0:00:00
DSL Severely Errored Seconds: 6020 6020 256 0:00:00
DSL Corrected Blocks: 354517 354517 15024 0:00:00
DSL Uncorrected Blocks: 352991 352991 14978 0:00:00
ISP Connection Establishment: 1 1 0 3:40:44

Now I must stress, this is very intermittent and some days may only happen once.  I dont really want my speed dropping again, and to be honest, my line has been steady for a couple of years prior to this.
Router = 2 Wire 1800 (Updated to latest firmware)
Filters = all have been swapped
Line = Re terminated by BT
Connection = Main BT Socket
Me = Scratching my head.....
Anyone have any Ideas?

[#2]

Is the router crashing completely or just losing the connection? If it losing the connection the router will still be running and it should record the resync in the log. Resyncs are often caused by interference, which can be hard to track down. Does it happen at the same time of day?
If it is locking up completely you probably have a faulty router. You could try updating the firmware.

[#3]

The router locks up compleatly, cant connect to it at all. shortly after, the link drops and a hard reset is required.
Firmware is up to date too.

[#4]

What's the firmware version? It might be worthwhile testing a previous firmware version. Alternatively do you have a spare router or know someone that would lend you one to test with?

[#5]

I do have access to another router, I will give it a go. I will also check the revision and see if I can wind it back. (2-Wire 1800 is my current router)

[#6]

Current Router Details
 
BT1800HG
• Software:  3.7.3

Connection Speed: 
• Incoming: 4096 kbps
• Outgoing: 288 kbps
DSL Connection Details
DSL Line (Wire Pair):                          Line 1 (inner pair)
Protocol:                                              G.DMT
Downstream Rate:                              4096 kbps 
Upstream Rate:                                  288 kbps 
Channel:                                              Interleaved
Current Noise Margin:                        22.0 dB (Downstream), 22.0 db (Upstream)
Current Attenuation:                          31.0 dB (Downstream), 18.0 db (Upstream)
Current Output Power:                      13.6 dB (Downstream), 11.4 db (Upstream)
DSLAM Vendor Information: Country: {0xFF} Vendor: {GSPN} Specific: {0x800}
PVC Info:                                            0/38
Maximum Transmission Unit (MTU):    1500

I cannot find any way of downgrading the firmware, but also th MTU looks quite high.
Any ideas?

[#7]

In a desperate effort, I disconnected the bell wire.
My logic was that the fault seems to be intermittent, so could be down to interference from a random piece of equipment.
I an sorry to say, that after 6 hours without the issue, and me feeling a bit smug, the router locked up again.
I will be attaching a new router and filters this weekend to try and completly rule out everything I can physically touch.
So by Sunday night, I will have done the following:
Changed Filters
Changed Router
Diconnected Bell wire
Checked and re terminated internal wiring
Had BT externaly check the line
Had BT check and re terminate line at main socket.

Realy need the router swap to make a difference.
Any other sugestions greatfully accepted.

[#8]

Side issue here:  you appear to be on a Fixed 4Mbps product and judging from your line stats, it's possible you could attain nearly 8Mbps.
It certainly sounds like a router problem to me, but it may also be possible to 'trial' the Max product and see if that makes a difference.
B.

[#9]

You are spot on there Barry, I was on ADSL MAX, trouble was that 6meg was about the limit for speed and gave me some major connectivity issues with line dropps occuring frequently.
I went through a week of testing with PN support wWho were excellent btw) where they started by dropping my speed down to 1meg and then gradually increasing it untill it hit the fastest stable speed. This was 4meg.
This was back when ADSL max was launched. (I have been with PN since feb 2003, lol)
If I ever get this issue sorted I would love to try the speed increase again, unless you think it may help me with this issue, in which case Max my ride baby, lol.

[#10]

Try your alternative router over the weekend - this will rule out problems with your existing hardware.
The Max product has improved since release - it may be worth trying it again, but rule out a hardware problem first
B.

[#11]

Will do.
Will post after weekend with update.
Thanks again.

[#12]

Right then, Update time.
I swapped out the Router, the cables and filters and replaced them with completly new ones.
So far.......................................................................
The router has been up and stable for 13 hours.
I will continue to monitor and report back later in the week
(But so far, it looks like the good old 2wire 1800hg is the issue.)

[#13]

Well as you can see from the data below, the new router is running stable and has been for over 24 hours........
             
DSL Line (Wire Pair): Line 1 (inner pair)
Protocol: G.DMT Annex A
Downstream Rate: 4096 kbps 
Upstream Rate: 288 kbps 
Channel: Interleaved
Current Noise Margin: 25.0 dB (Downstream), 24.0 db (Upstream)
Current Attenuation: 32.0 dB (Downstream), 19.5 db (Upstream)
Current Output Power: 19.8 dB (Downstream), 11.5 db (Upstream)
DSLAM Vendor Information: Country: {0xFF} Vendor: {GSPN} Specific: {0x800}
PVC Info: 0/38

Statistics
Collected for 1 day 3:43:17
Since Reset Current 24-Hour Interval Current 15-Minute Interval Time Since Last Event
ATM Cell Header Errors: 0 0 0 0:00:00

ATM Loss of Cell Delineation: 0 0 0 0:00:00

DSL Link Retrains: 0 0 0 0:00:00

DSL Training Errors: 5 0 0 1 day 2:35:27

DSL Training Timeouts: 0 0 0 0:00:00

DSL Loss of Framing Failures: 0 0 0 0:00:00

DSL Loss of Signal Failures: 0 0 0 0:00:00

DSL Loss of Power Failures: 0 0 0 0:00:00

DSL Loss of Margin Failures: 0 0 0 0:00:00

DSL Cumulative Errored Seconds: 0 0 0 0:00:00

DSL Severely Errored Seconds: 0 0 0 0:00:00

DSL Corrected Blocks: 4 0 0 17:19:41

DSL Uncorrected Blocks: 0 0 0 0:00:00

ISP Connection Establishment: 1 1 1 0:31:15

What sort of speed increase do you think i can get now the connection is stablised?

[#14]

I would expect 7500kbps down and 448kbps up - and that could be a pessimistic view.

[#15]

@TonyK
I've given your line details a nudge, can you have a look what speeds you are getting now and let me know if the line becomes unstable?