Hi,
I had a similar problem with the same kind of device after I had connected it to the PC via USB and then disconnected it. It froze and just showed the picture for connecting device to PC. The light at the switch still worked but nothing else. After a couple of weeks and some trying like recharging, reconnecting it to the computer and switching it on and off, one day it suddenly rebooted and started working again normally. Afterwards it didn't happen again and only minor problems with freezing have occured.
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