I am sorry but I can not solve your Samsung CEC issue. The TV just stop sending any CEC message to the device. Maybe a “heartbeat” or something like this is missing from libCEC.
It just stop at
Jan 10 19:23:29.505163 CoreELEC kernel: cectx ff80023c.aocec: cec a rx len 2:01 45
Jan 10 19:23:29.505484 CoreELEC kernel: cectx ff80023c.aocec: read msg len=2
Then nothing else get received from the TV.
I can’t help here much more as I have no possibility to make any deeper research about Samsung & CEC. May you use the kodi.log and dmesg log and open a issue at libCEC:
You also can try a firmware update on your TV.