Windows 7 input is intermittently disabled, how to fix it?

Question

Keyboard

Good day!
Keyboard input is intermittently disabled.
All keys work except letters/numbers/signs etc.
The on-screen keyboard continues to work.
Changing the USB port does not help.
Removing the device does not help.
Please help me to solve the problem.

Answer 1

Hello, here, apparently, we should continue testing by the exception method. The keyboard has already been replaced, so the following remained under suspicion:
1. The computer to which they are connected.
2. Drivers.
3. OS that controls the computer.
4. Nutrition problems.
5. Viruses.