I had the same packet loss problems last summer at various times intermittently. I had 4 tech service calls. 3 could not see any issue. The 3rd one changed the modem (extreme). The last tech actually saw the problem while he was there but had no idea what was wrong. He placed a "maintenance" call and the problem went away. Not sure what was done.
In the last few days, i've had the modem reset as often as every 2 minutes. Another service call. Another new modem. This worked OK for 2 days and now, i have the packet loss issue back.
I'm leaving rogers at the end of the month for tecksavvy over DSL.