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it will be the crank arm which is rounding out and causing the bolt to work loose. unfortunately theres no repairing that, just need a new crank.
have a look and see it will probably be going round instead of square, if so, thats the problem. in the interim you can tighten it up loads and go for a ride, keep an Allen key with you to nip it up as and when.
Dogtemple
Has anyone experienced a crankset bolt loosening off despite being torqued up properly?
I've got a BB30 crankset that has been remarkably quiet for several years but has recently started creaking a lot. It seems the self extracting bolt keeps working itself out and introducing play into the BB. Should I just torque it up tighter (currently going up to 40nm) or should I perhaps look at replacing the bolt? For what it's worth I've also applied some threadlocker on the bolt but it still seems to work itself loose after a hard effort.