Virator nut keep coming lose! Help

My virator nut keeps coming lose and obviously stop bike from pulling.. 3 times it's happen now, put thread tape and lock tight on it and still comes lose with under a mile, slowly applying thottle not trying to take of quick either.. help! Any ideas!! Been done up too 82nm aswell so iv not under tighten it..

 

Check threads on crank, new nut, are you fitting it on properly? Pulling the belt into the centre of the clutch running the belt high on the variator?

 

Check the splines inside the fixed vario half.
If they've started to strip it will clog up the splines on the crank and not fit tight.
Which in turn will cause slipping on acceleration, totally strip out the fixed half, and eventually knacker the crank splines.
And those fixed halves ain't too cheap for a decent one.
Don't even start me on the cost of a new crank........................