You should always use new bolts. I admit that I do not always on my 944. But then again I have had the same problems that you describe.
Cleaning the bolts and loctite is good. But also make sure that there is no grease in the holes. You can use q-tips to check and clean.
Also make sure that they are torqued properly.
I think I am finally going to get a drilling jig and safety wire the bolts. SwayAway makes these but in the wrong thread size. I don't want them loosening in a enduro.
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2005 987 - 112K miles PASM + 6-speed - Daily Driver
1988 944 - 240K miles- Race Car
1974 911 Targa - new project
2009 Triumph Street Triple R - 27K mi - Blazen Orange
1976 Ford F250 camper special - tow vehicle
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