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You're photographing at 1.6m focal length if the information you gave is correct, which is very long, especially for a beginner. Generally people don't recommend focal lengths over 600mm for beginners and you're way over, so you're not making it easy on yourself.
You won't get good subs at 2mins unguided at 1.6m with a mount of that class. You really need to start guiding.
As for the gif, looks like polar alignment drift along with typical period error. That big jump could be any number of things: cable snag, grit in your gears etc.
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