So I ordered two 16GB Sandisk USB drives last Friday. Normal format on the drives, did a quick format, and it works great. Loads the Seattle Avionics software/data much faster (on my home computer) than the slower USB drives I was using before and I am not having the problem I had with the same but larger SanDisk (were 32GB) drives. These are cheap on Amazon. About $6.50 including shipping and came in two days. For me, it's problem solved for now.
SanDisk 16GB Ultra Fit USB 3.1 Flash Drive - SDCZ430-016G-G46
Brad
SanDisk 16GB Ultra Fit USB 3.1 Flash Drive - SDCZ430-016G-G46
Brad