I live in Istanbul, Turkey. Just to remind you, my mouse has already been to the customer service and back with no solution.
I should also add that sometimes I have a notification on my screen that says "LOCK", but it never says "UNLOCK". It keeps locking its functions without even unlocking them first. Adding this to the random cursor speed changes, I highly suspect the Theron software itself. Uninstalling and reinstalling or applying the later fixes on the downloads page didn't work, though.