Magic Mouse is lagging after update.

Hi

My Majic Mouse has become almost unusable after I got the latest updates to my MacBook Pro.

It disconnects regularly, I have had to turn the tracking speed to 100% which is a real pain to use and I have followed the advice regarding conflicting devices and frequencies as well as cleaning the optical lens and blowing out the gunk.

It's about to be launched out of my office window! I have a Logitech bluetooth mouse connected for now but would like my MM back.

Any help?!

Thanks!