It doesn't take much pressure to cause it to change. Start using them, one because it is so much better keeping your eyes on the road and two just to get used to what it feels like when you do press on it.
Well, if it still happens, you at least ruled out the simple fix. Personally, my radio reception has been terrible since about 2015. I only get the two and occasionaly three local stations and that is it. Not the same issue, but an issue with the radio non the less.