Hello Fred,
It seems to be random - sometimes I have stability errors during day, sometimes it is on evenings, I do not see a pattern here.
I checked all connections again and I was trying to use difderent TV socket - still the same.
Maybe the router itself is not stable?
Is this possible to get other device? I don't need WiFi or other fancy features, it can be the simplest bridge (coax-ethernet).
Regards
Radoslaw