That happened to last week.
There’s a reset button the remote. On some remotes you can see the button. On mine, I had to take off the battery cover.
I did take that cover off, took out the batteries and still no visible button.
Do I have to unscrew the back and dissemble it ?
Granted we maybe be talking two different generations or layouts.
Mine has OK in the middle of the four arrows and magnifying glass directly center below that