Recently I've been having problems with a tuner showing it is in use (ABC or D -> colored pink) and therefore the tuner is unavailable

I check timers and also check current recordings and nothing is using them. Also check any possible streaming apps... and nothing is running that could be using the tuners.

Is there a way of checking what a particular tuner is being used for or which channel is being used?

I have Tuner A and B set up as cable tuners and C and D as sat tuners on 13e 19e and 28e.

Anyone have any ideas, up until last few days it's been working fine. but can't isolate what the problem is