RADIO UNIT CUTS OFF AND ON, ON A REGULAR INTERVALS

This happened on my 09 several months ago and I took the advice from somewhere on the Web to disconnect the battery for a time (I don't remember how long, maybe 15 minutes?). That worked great. Unfortunately it started again a few days ago and this trick didn't work. If I find something else, I'll post here. In the meantime, it's a simple thing to try.