Monitor Router re-syncs, error's, and .......

Hi,

I'm wanting something to monitor my router, it will stay stable at 4megs for about 7 days then all of a sudden it will double its noise margin to like 38db, and sync at 133.

I just cant figure what's wrong with it, this mess's up my BRAS profile quite bad. then i have to wait 3 days to get 3.5 megs profile.

I've tried to figure what can be cuasing the massive loss in sync and increase in noise. but for the last 3 weeks its happened on a friday, then week later saturday, then week later monday.

SO I want to monitor this and see whats at fault. Could this be a router fault?

Many Thanks

What hardware are you using ?

belkin