S6B UDP Binary Receive Stalls After Some Time

I have my S6B connected to my network to receive binary formatted UDP broadcast messages (about 950 bytes, once a second).
I can observe, that at random times the board would just stop receiving messages, only a reboot will make it listening again. Sending at the same time is unaffected by this.

Now with the exact same setup, if the messages are ASCII formatted, it all works flawless. Downside i cannot use ASCII in this case.

I assume the reception binary frame does something to the configuration. I suspected some command mode interference but that doesn’t seem the case. Firmware is 2026, marked as latest.

Help much appreciated!