DSL Training errors.

[#1]

Hello all.
I have a 2wire 1800hg router. Last night I decided to open a port on my router for p2p. I have used p2p before, same program I am using now and never had a problem until I opened the port. Last night I noticed the broadband light constantly going from solid green to flicking orange and back to green again. The flickering orange lasts about 10 seconds but happens every 3 minutes. On checking my router stats I noticed I'm picking up about around 5 - 10 DSL training errors on every 15 minute interval.
As soon as I stop a download the problem also stops. Apart from the obvious of closing the port, is there anything else I can do and does anyone know why this happens ?
Cheers in advance.

[#2]

Have you tried a different port?
P2P tends to use quite a lot of your upload bandwidth (not normally used in browsing etc).
What kind of stats does your router show?

[#3]

Hello and thanks for the reply.
After further monitoring I am still at a loss as to what is causing this issue.
I basically watched the router and the p2p program stats side by side for 30 minutes and found no link between the stats and the dropped connections.
I'd tried 3 or 4 different ports but the problem remains.
I tried limiting uploads and downloads, speeds and connections and the problem remained throughout testing.
My stats from tonight ....
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:       29 29 1 0:00:22
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:        0 0 0 0:00:00
DSL Uncorrected Blocks:       0 0 0 0:00:00
ISP Connection Establishment:    5 5 5 0:47:15
I'm using PPPoA.
Anyone from plusnet shed any light on any possible reason for drops from that side ?