tdm.log: more than repeated 100.000 messages: "unable to receive message"

Good day everyone, I recently noticed tens of thousands of repeated messages of this kind in /var/log/tdm.log: unable to receive message […] unable to receive message XIO: fatal IO error 11 (Resource temporarily unavailable) on X server ":0" after 97881 requests (97881 known processed) with 185 events remaining. (II) Server terminated successfully (0). Closing log file. # or: unable to receive message twin: Fatal IO error: client killed krootimage: Fatal IO error: client killed XIO: fatal IO error 11 (Resource temporarily unavailable) on X server ":0" after 951 requests (951 known processed) with 6 events remaining. (II) Server terminated successfully (0). Closing log file. where "unable to receive message" is the almost innumerably repeated part. I'm running TDE: R14.0.6 PSB on Devuan/ascii Has anyone seen this or any idea where it comes from? Kind regards, Stefan