Audio fail until power reset

Simon2

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Hi All
Newbie here & wondering if there is any help out there???
Audi A6 (c6) 3.0 Quattro 2010 2G low (I think)
Radio & Bluetooth packed up with no response from the MMI buttons after flat battery, renewed battery & problem persists, but if I disconnect the battery (hard reset) all works fine until I switch off for a longish period and then back to not working :rage:
Any one can help??
S2