Mine ('55 E91 320d/Prof headunit, no idrive) has started doing exactly the same thing. No BT and audio (alpine upgrade) has also started playing up - I get a 1/2 second of silence every 30secs or so.
Am going to pull the boot floor up and have a wiggle of all the connectors first. Wonder if something is working it's way loose... Then it'll be head unit out and see if that's got a similar issue.
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