I've had one since they came out, way back when, anyhow...Other than just lately I've never had any problems.
I was off the air for several years and I let all my radios sit in the basement, sometimes damp, sometimes super dry, I think the biggest was lack of use. So when I got the bug to get on again, it wouldn't function. None of the push buttons worked, couldn't key it with the mic or the key, the batteries appear to have gone to whereever batteries go when they expire.
Had the same problem, almost, with the Kenwood 2 Mtr multimode, wouldn't respond to the turning of the VFO dial, it did key up and the crystal selector worked.
So I sat there for a bit pushing buttons, spinning dials etc and finally got both the radios to respond to my wishes, 20 some minutes was sure a lot better than packing and shipping 'em off to some repair shop.
Looks like you have to treat the radio equipment just like a woman, FREQUENT tender loving care or else they'll go into disrepair.