Keyboard & Mouse locked and hardly able to control when pressing TOGGLE stop key

[Paladynee]

System specs: Windows 10 20H2 x64, i3 10100F, GTX 1050 Ti

Program version: 2.6.1.0 no update service

I use these driver stuff that might interfere with the application:
Motospeed K2 Keypad Driver
HIDUSBF USB overclocker or whatever
TabletDriver

5 clicks per second, works with any.
Start key J, Stop key K
Starting clicking with J, everything is fine. As soon as I press K, my mouse is frozen, my keyboard is locked and I can hardly move my mouse around. It's like my computer is frozen, but actually the mouse is the only thing thats having a hard time. It's very hard to click anything or even close the program. I genuinely do not know what causes this, but this is a serious bug.

Some info I've gathered: only works when the program is run in administrator mode.

WARNING: contains slur words, audio not needed, bug starts at 0:33~, before that is me struggling with Task Manager:

vidyo.1.mp4

[windows-2048]

Thank you very much for detailed description of a bug. I am starting to investigate it and let you know how progress grows.

[windows-2048]

Finally, I've reviewed the code and found I wish to rewrite it completely using Qt framework. It becomes bugless and cross-platform. I leave this issue open and let you know where Qt version will be ready.