I suffered very similar symptoms with no warning late last year.
Replacing the Relief Relay sorted it out (sourced one s/hand from a well known auction site)
Good luck with finding one quickly.
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1985 WR quattro
2010 A6 3.0Tdi Allroad
2010 A3 1.4 tfsi Sport - Sold but still in the family
1984 80 Quattro - Sold many moons ago
1981 Coupe GT - Sold to buy above
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