You are not alone!
In the last couple of weeks I have noticed exactly the same. I rescanned which fixed the EPG issues but am still having problems with the remote. The buttons felt slow / unresponsive (particularly media and guide) and weren’t improved by new batteries. I suspected a remote fault and looked into replacing it. Have had bad experiences with some of the budget alternatives in the past so was about to shell out £30 for a genuine Humax only to find there is a “national shortage”.
This would suggest to me that there is a software issue as everyone seems to have been having the same problem as us and has had the same idea?!?!
Is there anyone else out there with the same problem? Weight of numbers may confirm a cause and / or solution? I have also posted on a different thread re done recording / sound issues … could the 2 be related?