Docker UDP - Error [ERR_SOCKET_DGRAM_NOT_RUNNING]: Not running

Hi,

I have three docker container on my Synology running, which work fine.
One of those 3 Instanzes is sending and receiving data from my KEBA Wallbox via UDP. This is basically also working fine.
But after some time, the system stops working with the Error:
Error [ERR_SOCKET_DGRAM_NOT_RUNNING]: Not running

I assume, that docker or the synology is not handling the socket anymore...

Only restarting the sysnolgy helps to get everything back to normal.

Any Ideas?
Docker: 18.09.0-1110
Synology: DSM918+ with DSM 7(also happend on DSM 6, so no beta bug...)

cheers.kg