Front Brake Caliper Attachment Bolts

[good4us]

I replaced the seals in the forks of my 2007 Speedmaster last year. I torqued the brake caliper bolts back to the factory setting. Last week I discovered one bolt on the left caliper had unscrewed itself and had fallen out and the other one was ready to fall out. One bolt on the right side caliper was a little loose, the other one still tight. I have ordered replacement bolts. Is this a common problem? When I replace the rotors later this year I plan on using some blue thread lock to help prevent this happening again. If anyone else has similar experiences I would appreciate your feedback.