USB streaming still works but USB flash drives no longer recognized?!?

in GROM-USB2P edited December 2016
GROM-USB2P-TOY S/N 844C firmware v87

On one recent cold morning in Chicago, the USB2P no longer recognized the two USB flash drives I keep in my car. Upon insertion, the HU would just show the firmware version 87. Power cycling the system did not help either. 

These flash drives used to play fine for several months. I figured they had frozen and took them inside, but they worked perfectly fine. I then prepared two additional flash drives of a different type, following the format required for the USB2P, but the USB2P did not recognize them either.

Meanwhile, USB streaming from Android continues to work just fine.

Any ideas? Thanks.
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