No, Verizon doesnt shape or throttle connections. At least not yet. Other companies have said that they are going to start this in the near future, but Verizon came out and said that for now, they have no plans to do this. They did hint that it may become necessary in the future, but for now, its still wide open.
The likely problem is that the is a hop in either the verizon network or on the internet that gets switched at night.
Try running a tracert both in the morning when everything is looking good, and again at night when you have the problem and post them here so we can take a look to see if there is anything obvious. This wont tell us the throughput but it may tell us if you have a bad hop or something.
To do a tracert go to the command prompt and type
tracert www.xxxxx.com where xxxxx is the ftp site your using.
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Error exists between keyboard and chair.
