RCA tv plays in 4k, but when turned off and turned back on it changes back to 1080p

Apr 23, 2018
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When I turn TV on RCA model RLED4960-UHD I can change to 4k mode on my Bell 4k Cable box. But when TV is turned off and than back on when I go to watch TV again it auto changes to 1080p again.

I have to manually change to 4k resolution each time tv turns on. It keeps switching back to 1080p when turned off and back on.