Playback slowing down and creating harsh sounds

I am in the middle of writing a percussion piece when all of a sudden, the last few measures I have written start slowing down and producing harsh sounds that are quite hard to explain. I've done a lot of testing with it. The problem occurs depending on where you start the playback. Start too close to the specific measures and it won't happen and start too far away it won't happen, though I have yet to find the exact point that it switches. It is not hardware specific, it happens on both my headphones and my speakers. It also seems to be coming from the marching snare part, though removing the part only sometimes removes the problem. I've attached the score. If anyone else playing it does not have the same issue, it may be a problem on my computer, in which case I am using Windows 10 and would appreciate any tips on how I can fix it on the computer. Thanks!