It is hard to trouble shoot which part is broke if there is no consistency in the problem. It is usually the contractor or switch though. The switch on your handle bar usually has two screws to take the housing apart, then you can make sure it is clean. The contractors going bad are very common as well. I keep am extra, $30 on ebay.
If you can get the problem consistent, do a search on the forum. There is a thread I posted in that will tell you how to switch wires and test it.
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2015 Sportsman 570 Touring EPS - 26" Big Horn 2s, ITP Delta rims, Polaris 3500lb winch.
Sold - 11 TB 330, 11 SP 500, 13 SP 500