So I decided to bypass systematic problem solving and just throw more money at the situation on the assumption that Ros was right and it was the USB adapter that was the problem.
Since I had never had a problem receiving a signal before, and the new router I bought is supposed to be an upgrade in every way, I thought it might be a problem with the adapter not being strong enough to send a signal back.
Ended up giving up on USB adapter and tried a PCI adapter, and then bought a heavy duty antenna for some extra insurance. Could be jumping the gun a little, but it seems like this was correct and everything has been working great so far! Better, actually. I've been going off of a wireless connection for at least 6 years now, and I'm used to 54Mbps max if lucky and at full signal strength. Now I'm getting a very steady 270Mbs (sometimes maxes at 300Mbs) and the difference is substantial. No signal drop or even a slowdown or loading problem in over 2 days so far. Crossing my fingers. Thanks for the input, everyone.


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