Radio changes channels

[DonR]

The last few weeks the 8.4AN radio in my 2015 Longhorn has started changing the SiriusXM channels by itself. At first I thought I might be hitting some of the steering wheel controls but then I was sitting in a parking lot listening to the radio with the ignition switch in AUX and all of a sudden the channel started going down then back up to the one I was on originally. Sometimes it goes back to the original channel and sometimes it just jumps up or down one or two channels and stays there. SiriusXm is about all I listen to so I'm not sure it the AM/FM frequencies are doing it too or not. Anybody else experienced this? Thanks.....Don