The CDM1550LS+ I have in my car for scanning all of a sudden stopped being able to add and remove channels from my scan list. I'm on a trip right now, it was working fine yesterday, it still say "channel deleted" or "entry saved" when I try to add or remove a channel, but the channel isn't actually deleted or added. I've been using this exact radio for a few years, nothing has changed. Is there some button combination I could have accidentally pressed to cause this? I'm stumped, I've tried power cycling the radio with no change.