I've used loctite with no problems at all. I also torqued it to the Campagnolo rating using a torque wrench.
Maybe you should try a stronger thread lock.
@rodabod started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
I've used loctite with no problems at all. I also torqued it to the Campagnolo rating using a torque wrench.
Maybe you should try a stronger thread lock.