Have a dig through the settings and see what if anything isn't right. I have had these things go a little funky before and one thing with some of the Garmin stuff is they tend to not like grouping say all of the radio settings in the same place in the menu platters. It can be a bit of a skull crush until you work out which menu you need to start from to get to the setting you need. Sometimes the setting you want is greyed out as well - I had to do a software update on one of mine to correct a few unusual gremlins that resulted in this issue. I tried a reset to factory settings first and that didn't work so the 'update' to the same software version was the next step and it worked.
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