Yes, this actually ONLY happens when (and because of) picking up (with lasso/cutter) and stamping numerous times. And ONLY if you do it numerous times in the same drawing or in copies of that problematic drawing.
You should get a warning about this in the software if it takes more than 2 seconds to pick something up. Which is insanely long. Try not to use the lasso that extensively. So, if you need to copy a drawing (frame), you do a clone of it and hit o (standing on the clone) to make it a new original. Much better than lassoing and stamping in a new blank drawing.
Then you will NOT have the slow lasso pick ups. Let me know if this works for you?