Hi,
What is the source of the TV signal, e.g. an antenna, a cable box, media streaming device etc?
If it occurs when watching TV channels what is the ''signal strength'' as shown on the TV?
Can you check if there is a difference in the signal strength when the TV is in the room where it has a problem and when it is in the room where it doesn't have a problem?
I realize that you said that there are new cables but is this only from the TV wall outlet to the TV and not the cable to the TV wall outlet from wherever the signal is coming from and is split between the rooms?
It may be if there is a weaker signal in the one room then the TV may have problems whereas the other TV, if it is a different make and model might not, as it may work better with lower strength signals. This is only a guess but you have to eliminate things to find out what is going on.
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