I also get this pop and bang from speakers, probably for last two weeks. I thought it's plastic bottle making that pop noise, after sitting in the sun. But today, after the pop, SOS system went out and I got error on the dash. Navigation didn't lose location, but was a bit off when getting close to home. It jumped between streets nearby. Now Cupra App is not showing correct status as well, because car didn't update servers about it. It's showing status from work couple of hours ago, open door and bonnet and car unlocked.
It's interesting that it started to happen only recently. Problems with SOS or communication modules failing after some time or some backend issue on VW servers?
Did you apply the recent update as of a couple of days ago (not a major update with visible version change)?
It mentioned connected devices amongst other things, not sure if it’s relevant.