My rear brake lever has started sticking, in that there is some initial resistance to braking, in the lever I think, with more pressure you go past the point and it works. It comes and goes too, but always that lever, when you get past the resistance there is a sort of clicking sound. bit wierd and a little worrying occassionally.

Any thoughts

Not too sure if you can srtip strip SLX brakes?

Seen this a few times, usually a caliper piston sticking.Another possible cause could be if the reach has been adjusted too far, causing the lever to go "over centre".