you could get a magnetizer and run it through that a few times. even something cheap like this should do the trick: ebay.us/m/18o4zx

magnets just lose their strength over time and repeated use. the Samsung flip phones use magnets to detect when it’s open or closed, and a lot of the time they’ll lose strength and the phone won’t detect that’s it been opened or closed. I have pretty much that exact magnetizer and I run the magnets through that a time or two and everything starts working again lol. I assume the same concept should work for you.