This happens to me EVERY. SINGLE. DAY... perhaps even hourly. Get used to it. It also happened in Studio 2017 but occurs more often in Studio 2019. I regret upgrading. 

The same thing happens with Ctrl-Z, which is actually even more annoying. Here's another one: F3 for concordance search often brings up the search bar with a message prompting me to enter the text to search for. That really defeats the purpose of the shortcut key. Ctrl-H, Ctrl-F, and Ctrl-T stop working too.

I've tried all of the suggested tricks: repairing the program, uninstalling all traces of Studio and reinstalling, switching from a virtual machine on a Mac to my PC, BUYING A NEW PC, etc. Nothing works. I use Studio at least 12 hours every day, and I really don't like closing and restarting the program every hour. 

This happens to me EVERY. SINGLE. DAY... perhaps even hourly. Get used to it. It also happened in Studio 2017 but occurs more often in Studio 2019. I regret upgrading. 

The same thing happens with Ctrl-Z, which is actually even more annoying. Here's another one: F3 for concordance search often brings up the search bar with a message prompting me to enter the text to search for. That really defeats the purpose of the shortcut key. Ctrl-H, Ctrl-F, and Ctrl-T stop working too.

I've tried all of the suggested tricks: repairing the program, uninstalling all traces of Studio and reinstalling, switching from a virtual machine on a Mac to my PC, BUYING A NEW PC, etc. Nothing works. I use Studio at least 12 hours every day, and I really don't like closing and restarting the program every hour. 

It came back on mine today. It seems to happen - in my case anyway - with certain file types. xlz files seem to be the worst. I'll try and keep a record of what file types it happens but there's something odd going on with shortcuts.