Hi Stevels,
i'm new here but maybe i can help.
What language do you use? ALT y only works on english systems. My german computer need ALT j. I Optimized my scripts now to just press all the buttons.
What antivirus do you use? I found that Sophos Home and i think it was Avast steal focus of the UAC window so that key injections didn't work anymore. Turns out that the full Endpoint protection doesn't do such a thing....what a joke.
A simple solution would be to maybe start a VBS Script which waits for a hotkey and puts the mouse in the middle of the screen and just clicks once and then deletes itself.
Voila get wrecked ducky countermeasures.