I have a 2018 WRX currently is stick and only 7 months old. I find that recently I’ve been having a lot of problems with the audio equipment. Most notably unplayable files. I have an iPhone and I connect it to the cars USB via the standard iPhone cable. The phone with connect and charge but will not play audio. Keeps coming up with unplayable file error. In addition to this problem I have had an issue where the volume seems to turn itself up or down on its own. My parents have a feature on their truck that does that when the engine rpms change so that the sound of the engine doesn’t over power your audio. But mine WRX is doing it while cruising at a steady rpm range. Any help on either of these problems would be most appreciated thanks.