Treadmill troubleshooting, need some help

Today i was running on my treadmill and i noticed how the treadmill was changing speeds and the belt was sorta like making me jump while i was running sorta like to make me trip. I dont know whats wrong with it, i opened it up and everything seemed fine, it was dusty but i dont know whats up with it. When i was running on it it was like making these quick stops and it kinda made me trip so i just stopped before i injured myself

Anyone had this problem? And whats up with it?
 
I have it all the time, I always chalked it up to off pace running. I naturally want to keep accelerating so sometimes I begin to pick up speed and I tend to leave the ground more, making less resistance on the belt making it accelerate a bit faster than designed and when you land it is at an off pace which makes you trip up some. But I could just be entirely wrong. (I never worried since I usually never experienced it after 2-3 minutes in)
 
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