Loops engaging automatically without being triggered

From time to time (happens more than a couple times a night while I'm playing also happens on different tracks sometimes right when I start playing or an hour or two into my night) when I'm playing a track about 2:30 into the track a loop will engage always a 1/2 beat loop even if my loop setting is set to something else. Ive tried to duplicate the issue and its totally at random. I have not set any loops to trigger automatically with the tracks. I have gone back to export mode and checked to see it they are all cleared and they are.