Volume increasing suddenly??

[2017ModS]

Hi, has anyone had a similar problem? Came back to locked M3 and noticed the radio was on full blast. I had to do a hard reset (with steering buttons). This has happened twice. Any ideas on what the problem is?

 

[Marsnaut]

I remember seeing this happening to some others, but I can't find the posts.

 

[Chewy3]

Phantom Touch in Model 3