This is an absolute stretch.. if you are connecting wirelessly, double check that you are connecting to the correct wireless network. There were times where my connection would drop and my computer would find the next nearest wireless network (a neighbors network) that was slow as can be.
Vz Voice Portals & Connection Wizard
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See this thread: http://forums.verizon.com/vrzn/board/message?board.id=High_Speed_Internet&thread.id=2005
I believe your problem is similar to those described there.