does locktite go bad?

Thats odd that they would loosen with locking compound. I would clean out the holes,brake cleaner and compressed air and try it using the locktite gel.
Perhaps its the heat loosesning the bond.
If thats the case, go with red.

As far as studs go, then use the stud and bearing mount. It will fill the threads.

Industrial blue vs home mechanic locktite are two different products. And prices.