Turn everything off and unplug every cable into the router, including the phone line and power. Leave five minutes, securely reconnect everything, and try see what happens.
Have you tried a different router?
If a similar sync, and the error rate continues, it could be a coincidence at their end, or the router can't cope, (was it OK for the first 3 days and what did they get?), or a faulty connection at the exchange.
Could be the line card in the MSAN, could be dodgy jumpering.
10-day period completely irrelevant. Scream! Unless it is their end as above.
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