MMI Rebooting Itself When Satnav Following a Route

MikhailCompo

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I have an S3 8V facelift.

When following satnav the MMI reboots after about 15 minutes of driving. The screen retracts into the dash and the unit completely powers off before coming back on (without previous destination routed, very annoying).

The problem started after I took it for an MOT and service at my excellent Audi specialist indy garage. I've asked them about it and they can't offer any suggestions without bringing it in which is a pain as they don't offer courtesy cars.

This might be useful: On a hunch I had read another user experienced same problem when the battery was on its way out. So I replaced the EPS battery with a good Bosch AGM battery, recoded.
Now I still have the same problem, but whereas before the screen would fully retract before booting back up after a second, the unit comes back up before the screen has time to fully retract.

So clearly changing the battery has had some impact, but it's not fully resolved.

Can anyone offer any advice for a permanent fix?