I have been experiencing this issue where some of my keys on my “BlackWidow V3” keyboard stop working sometimes but in a super weird way. I’m pretty certain that it’s and issue with Synapse 4 because the key’s immediately start working again after I focus the Synapse application. From what I noticed is that it only effects lower case “h” and “c” and possibly “k”. When the issue occurs I can type the uppercase variant’s, of the before mentioned keys, just fine but still get no input when lowercase until I tab out of the game and refocus the Synapse application.
It makes me wonder if this issue could be caused buy “Full-screen Windowed” games/applications because I stumbled into similar Issue while using OBS and an eye tracker where the stream video would bug out the second the game was tabbed back into (Counter-Strike 2). Some other person experienced the same exact issue but in Call Of Duty. So in both of those games, they have quite a few compatible issues caused by their Anti-Cheat systems, it’s been reported to cause issues with programs that capture/hook into the game window (Discord Overlays and OBS Game Capture Sources)
So Idk what’s that all about but... I feel like I'm onto something potentially?