A problem I've seen on many forums, but yet to find an answer. Very precise, my MMI is normal for 17 seconds, then turns off for 3, and back on again for 17 seconds, off for 3 ad infinitum. Nothing works while switched off, phone, CD, radio. I've done the normal reset without success. This has been going on for 2 months save one single journey when it worked.
This fault is so specific, it can surely only be one thing, but what? Can anyone help?