which cable modem do you have?
if it is LanCITY (a big heavy brick with integrated heatsinc) call them to get it replaced ASAP.
I find that problems come in waves.
I am fine mostly and then for a few days the line drops.
I call them, after going through the powercycle, reboot, etc. garbage - they say it must be a problem with my house and they will send out a tech. 20-40 minutes after I schedule the visit and hang up the problem "goes away like magic" and I call to cancel the onsite.
go to dslreports.com
the forums there are very informative.
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