We will need more information. Are you connecting using wireless? Wired? Which modem do you have? Do any lights go out on the modem when the problem occurs? Have you called tech support to ensure the connection is stable?
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Short version new router (2200) and bridged on port 1 to rtac68u router. 3 outages I know of in 48 hours. Sick to my stomach that I left shaw after almost a decade for this. Did I just push a pile of crap from one corner of the room to another? Good grief!