”Strip” in this setting is generally used to mean threads pulling, or wearing out.
I assume you’re talking about destroying the fit at the square taper.
The most common cause of crankarms working themselves loose is insuffficient torque at assembly. Once an arm has started to wobble it’s often a lost cause.
It doesn’t take much to destroy the fit.
Some have managed to save damaged cranks by using epoxy/chemical metal fillers on the faces. Some have managed to file the hole back to square.
The bolt coming loose is a consequence, not a cause.
Are you sure you have the right cranks for that BB?
There are two different tapers.