I've been struggling for most of a year with this. High speed i7 pc running Windows 7 direct wired in. In the morning, I can send anything, or late at night. In the afternoon, my upload speed drops to under 10 mbps, and it can take me 45 minutes to send an email with a 1 MB attachment if I can even get it to go without failing. Verizon says it must be my computer, but settings don't change every day as the clock moves. Has anybody else experienced this? Is FIOS just running out of bandwidth?