Can't be sure this is the issue, but I have something similar happen to me, but under these conditions;
-The tv is on antenna.
-I changed all my ceiling lights to LEDs.
-When I turn lights that are near the antenna, the tv doesn't go blank but
I loose reception. The LEDs emit interference that affects the tv signal.
2021 GM Denali HD 3500 Dually Diesel 4x4