Same thing happening to me...

I use a DIY wheel with a USBD480 screen connected on my pc with usb port and sometimes, after ~45min-1h of game, my screen completly freeze ( the wheel and button on it continue to work perfectly ) 

There is the log i have in simhub : 

INFO - New fuel stat aggregated 4.22/lap
INFO - New valid lap detected
INFO - Storing lap consumption : 4.22, lap start : 42.36, lap end : 38.14
INFO - Fuel at the beginning of the lap : 38.14
INFO - Old map quality score : 7 / New map quality score : 6
INFO - Delta vs previous all-time best :0.653
INFO - Delta vs previous session best :0.398
INFO - Persistent tracker plugin new lap event execution time : 1.9583ms
INFO - New fuel stat aggregated 4.28/lap
INFO - New valid lap detected
INFO - Storing lap consumption : 4.26, lap start : 38.14, lap end : 33.88
INFO - Fuel at the beginning of the lap : 33.88
INFO - Old map quality score : 7 / New map quality score : 5
INFO - Delta vs previous all-time best :-0.023
INFO - Delta vs previous session best :-0.278
INFO - New All time best recorded 00:02:18.5790000
INFO - New session best recorded 00:02:18.5790000
INFO - Persistent tracker plugin new lap event execution time : 2.9246ms
ERROR - System.Exception: USBD480 Exception0
at SimHub.Plugins.OutputPlugins.GraphicalDash.BitmapDisplay.USBD480.USBD480ManagerEx.check(Int32 result)
at SimHub.Plugins.OutputPlugins.GraphicalDash.BitmapDisplay.USBD480.USBD480ManagerEx.SendBitmap(Bitmap bmp, Boolean flipDisplay)
at SimHub.Plugins.OutputPlugins.GraphicalDash.BitmapDisplayBase`1.SendPicture()
INFO - Web client disconnected : 127.0.0.1 RSC - iRacing - 480 iRacing Dash

I have to replug the wheel to get the screen working again and i have the same trouble with all usb port of my pc 

If someone has already seen this error

Thank you very much