I reinstalled version 1.81.613202 of Options+ today because the older version wasn't recognizing apps so it wasn't switching all the button assignments automatically.

I'm glad to say that the tracking on my Mx Master 3s is fine now, still some stutters but nothing consistent. However now my m720 loses tracking with both BT and RF connections. I can tell m720 is losing connection because the sensitivity changes but I can also see that it reconnects via the dongle very frequently from the home page; less so with BT.