The chat support from the company is at times ... spotty. One of the help supers that's "in here" several times a day suggests that ANYONE with a Premiere Pro issue going to either chat or phone help, on getting a live body respoding, IMMEDIATELY ask for the "Video Que".
As then you do get specific PrPro knowledeable folks, not the regular generalists.
But as Peru Bob says, you may well get better results here. There's a lot of us volunteers that between us have an amazing depth and breadth knowledge of just getting stuff done, as-is, with this app.
What's the polling rate on your mouse? I've seen issues where if your mouse's polling rate is too high (common on gaming mice) the interface can do this. Try lowering the polling rate to under 250 and see if that helps.