Hello!
I use my Macbook Pro 2015 with a external display and a magic mouse with magic keyboard, they are first gen. For some reason, after a sleep at the login screen when I press the first key to enter my password the magic keyboard lags and then the interface show an increasing number of dots, like it is repeating the same key forever. Because of that, I can't obviously properly enter my password. When I turn the magic keyboard off and then turn it on again, everything works fine. This problem only happens after a sleep (works after a macos restart and shut down) and never did in any other place while using the OS.
I tried to reproduce in a Macbook Pro 2011 with High Sierra and it worked fine after a sleep. The keyboard seems to be good enough.
I used Filevault and then disabled thinking it would help because it has issues if turned on with mx master bluetooth in login screen, as logitech warns.
Anyone knows what is going on? Thanks!