Sounds like a defective switch. The feature you have lost is just one action that switch controls, but since it’s all included as one component, the entire switch needs to be replaced. But first, how does the switch feel when you push it? Is it the same normal feel?If it feels normal, you might try returning the radio to factory specs and reloading your programming. If that works you probably had a corrupted SD Card. If it doesn’t feel like it did when it worked it’s probably broken. If you are good with minor repairs you could replace the switch yourself but Uniden will do it for a flat repair fee.
That particular switch controls the obvious volume adjustment, but with extras. It’s also what’s referred to as a “ganged switch”, where pushing down on the knob gives you an additional push button type of switch which can be assigned to other functions. (Other ganged switches even have another function “stacked”. So, when designing portable handheld radios there’s only one hole that needs to be present for controls… important when considering there ain’t much room for additional control functions on a handheld.
