The "good" news is that its not likely to get better on its own and as it happens more frequently (and for a longer duration) it will be easier to find the cause.
But to be honest, I'm not sure that is going to make you feel any better.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor