I too thought that this had happened to you before. Quite recently too, if memory serves. I seem to recall it resulted from an over rev during a missed shift.

If you clean the threads in both the bolts & the holes till they are sterile, then follow the loctite directions to the letter, & overtorque the flywheel bolts by about 5% you will help to keep those bolts in place.

Chris, the Boss at the local service station, overcame the problem after losing a couple of flywheels, with a custom made harmonic balancer, [see my photo album] & i will be using one on my coupe's engine. I believe that they also improve the level of smoothness in the running engine. At my age, i'm all for engines that run smooooooth while still delivering the goods.