At random times when building, left clicking to select a part will add to the already selected part, now selecting both and clicking another part will add a third one to the selection. When this bug happens, WASD cannot be moved to pan the camera around and the scrollwheel doesn’t zoom in and out either.
Did you save, close out of Studio, then reopen the place to see if it still happens?
Yes.
Does it happen in all places, or just one?
All.
When did this start happening?
Around November.
Have you Searched the forums to see if other people have had the issue?
Yes.