Okay, this is bizarre & annoying... a couple of days ago (can't connect it with anything I installed or anything like that) my mouse movement went weird. It jumps, it lags, it won't move then jumps etc etc. Tried replacing batteries, restarting everything, but still it happens. Annoying thing is it's not constant. Happens for a minute then goes away then back again... My Mac is 27" Retina running 10.11.6 & the mouse is a Logitech M525 Really, really appreciate any help before I smash my mouse into itsy-bitsy pieces.