Probably related to amount of heat/temperature. Different materials expand at different rate as temperature raises so it might be making good connection when cold and hot but somewhere in between there is a point when it's a bit loose.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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