Hi Larry,
The USB sticks you are currently using are probably just too slow. The stick with only 1 GB of storage space is probably many years old and for this reason is likely to be significantly slower than currently available sticks.
I recommend buying a current USB 3.x stick with e.g. 16, 32 or 64 GB and the highest possible write speed.
By the way, the keyboard has only USB 2.0 ports, but USB 3.x sticks are usually faster on USB 2.0 ports than old USB 2.0 sticks, and the stick is also much faster when copying data to/from the computer (if, as is common today, the computer supports USB 3).
Best regards,
Chris