So in the last week or two, my 500 has become plagued by what appears to be a stuck key. It's intermittent and I can often remedy the condition by pressing hard on the down arrow (it's the up arrow that appears to stick). When the key, or the contact at least, sticks, the radio will be essentially unusable. It won't stop on any transmissions and you can't change anything in any menu. I just wanted to see if there was anyone else that has come across this issue and if there is a simple DIY solution to it before I ante up and send it to GRE.