They often have seals fail on the rear caliper, allowing moisture to get in the caliper and cause brakes to stick. The switch on the handlebars is a known problem on Banshees, Warriors, and 660 Raptors. When the switch, or contacts stick, they cause a limiter similar to the reverse rev limit. Also racers remove the handle, cable, and guts to the parking brake on the rear caliper and replace with a block off plate for weight savings. I am not telling you to remove it if you are not comfortable with that. Just to test the contacts to eliminate that as a cause of your symptoms. From what you described in the first post, it sounds like a distinct possibility. If the problem is in the parking brake limiter, the contacts can be cleaned and lubed and should be fine, until it happens again.