MacBook screen freezes after unlocking

Discovered that when your screen sleeps in order to save energy, and after a while you try to activate your mac back again, and.....then you realize that although the cursor (arrow) is working, your mouse trackpad area is unable to effectively "click" over items...it freezes for apparently no reason. Needed to restart in order to being able to click back again.

I finally discovered that the issue is related to having an external wireless mouse "ON" near to your mac.

The conflict between the mouse trackpad area and the external wireless mouse finally makes your Mac to freeze. Solution? Make a choice....turn that external mouse off ....or use it instead of the mouse trackpad of your mac.

Good luck