Clara HD Clara HD screen flashing on and off

[Desertway]

I've had the device for about a week. It was fine until this morning. When I connected to USB the screen started to flash from the sleep screen to the home screen. I'm on the latest firmware, but I assumed that this was the often commented upon USB recognition issue, even though I'm not getting any error messages on the PC. Oddly, the flashing persists after I disconnect from USB. On the other hand, it stops flashing after I restart the device, only to begin again with the USB connection. Disconnecting and rebooting seems the only way to stop it.

Edit: It looks like this issue was caused by the magnetic sleep/wake case I was using being triggered by my PC housing. Problem solved.