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I've since updated my Android emulator from BlueStacks 4.28 to 5.0.200 (separate brand new application) and haven't seen any keyboard dropouts in the past 3 days.Definitely still an issue even with my 3900X + CH8 Impact, which wasn't affected by the initial reports of USB dropouts. My keyboard drops out now and then with 3601, but has been less frequent than 3402 and 3501. Back when I used 3003 (and any previous BIOS since launch), I had zero drop outs.
It's the only USB component that drops out and the keyboard isn't dropping out when connected to other PCs and a laptop.
I'm also observing that the keyboard only drops out when I run my Android emulators (BlueStacks 4.28) to play games on the PC. I do run them with CPU Virtualization turned on, but I don't think that should affect a keyboard in any way. When the emulators are off, the PC can idle overnight without the keyboard freezing.
I'm still on BIOS 3601 and haven't changed any BIOS settings, so my previous hunch on the emulators causing the keyboard to freeze/drop out may have been right after all. I don't really understand why or how an emulator could cause a keyboard to drop out, but I'll continue to test out BlueStacks 5 for now. I'll also check to see if BS 4 would cause the drop outs to occur again.
I'm just happy not having to unplug and replug the keyboard everyday. It gets old after months of doing it and is especially annoying when the drop out occurs in the middle of a gun fight in an FPS game.