CC2531 both led are lighting

yesterday i recognized that my zigbee devices are not responding anymore. So i had a look into my zigbee2mqtt and saw that the stick is disconnected.
If i pull the stick and put it in again the green led just flash short but then both led are lighting very light. The Raspberry pi did not detected it again.

I could reflash it, bit it does not help. Nothing changed. So i guess its dead? I cannot find any information about this situation on the internet.
May you can help?