Any idea why this happened - multiple loss of PPPoA connection

[#1]

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Wed, 2010-07-28 16:21:37 - CHAP authentication success Thu, 2010-07-29 08:26:09 - Administrator login successful - IP:192.168.0.4 Fri, 2010-07-30 02:01:49 - Initialize LCP. Fri, 2010-07-30 02:01:49 - LCP is allowed to come up. Fri, 2010-07-30 02:02:49 - Initialize LCP. Fri, 2010-07-30 02:02:49 - LCP is allowed to come up. Fri, 2010-07-30 02:03:45 - CHAP authentication failed Fri, 2010-07-30 02:03:45 - LCP down. Fri, 2010-07-30 02:03:49 - Initialize LCP. Fri, 2010-07-30 02:03:49 - LCP is allowed to come up. Fri, 2010-07-30 02:04:42 - CHAP authentication failed Fri, 2010-07-30 02:04:42 - LCP down. Fri, 2010-07-30 02:04:49 - Initialize LCP. Fri, 2010-07-30 02:04:49 - LCP is allowed to come up. Fri, 2010-07-30 02:05:32 - CHAP authentication failed Fri, 2010-07-30 02:05:32 - LCP down. Fri, 2010-07-30 02:05:49 - Initialize LCP. Fri, 2010-07-30 02:05:49 - LCP is allowed to come up. Fri, 2010-07-30 02:06:49 - Initialize LCP. Fri, 2010-07-30 02:06:50 - LCP is allowed to come up. Fri, 2010-07-30 02:07:50 - Initialize LCP. Fri, 2010-07-30 02:07:50 - LCP is allowed to come up. Fri, 2010-07-30 02:08:21 - CHAP authentication failed Fri, 2010-07-30 02:08:21 - LCP down. Fri, 2010-07-30 02:08:50 - Initialize LCP. Fri, 2010-07-30 02:08:50 - LCP is allowed to come up. Fri, 2010-07-30 02:09:49 - CHAP authentication success Fri, 2010-07-30 02:59:49 - LCP down. Fri, 2010-07-30 02:59:56 - Initialize LCP. Fri, 2010-07-30 02:59:56 - LCP is allowed to come up. Fri, 2010-07-30 02:59:58 - CHAP authentication success Fri, 2010-07-30 09:20:38 - Administrator login successful - IP:192.168.0.4

Routerstats shows no loss of connection and the connection speed hasn't changed which it would have done with a resync at that time in the morning

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Noise Margin:    9.1  dB Connection Rate:  3776  Kbps Line Attenuation: 51.0  dB Power:            19.1  dBm Max Rate:        4064  Kbps SF:              9015671 SF Errors:        90 Reed Solomon:    306532826 RS Corrected:    23588 RS Un-Corrected:  461 HEC:              78

[#2]

Tried an alternate router?

[#3]

No
The only other one I have is a Speedtouch 585v6 and I can fiddle with the noise margin on that as well but why would it be a router problem.
I have checked the router log back as far as the 13th June and this is the first time it has happened.
This is why I wondered if it was something at your end

[#4]

Looking a bit closer, it looks like BT scheduled maintenance which often starts at 2am. You'll notice there are only two successful authentication attempts in there, the rest are failures between 02:01:49 and 02:08:21.