Windows 10: logitek wireless keyboard problems

An hour ago, my logitek wireless keyboard MK320 began making errors. For example, I hit the 'u' key and '4u' appears. I hit 'e' and my firefox browser opens. I've rebooted, unplugged and plugged in the USB wireless, checked that I'm using a US Keyboard. Nothing changes. Any suggestions?

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logitek wireless keyboard problems

Thanks for the suggestions. I tried them all; none worked:
1. I plugged MK320 keyboard into another computer; same problem.
2. I plugged another wireless keyboard into main computer; it worked fine. The dongle was in the back of the computer, and the keyboard was 10 feet away from the computer.
3. I changed batteries; same problem
4. I ran Find_ANY_Problem_Devices.bat A minute later I got the report 'NO PROBLEM DEVICES WERE FOUND!'
So, it's definitely a keyboard issue and not a computer issue. The keyboard needs to be reset.
How to reset logitek wireless keyboard MK320

 

logitek wireless keyboard problems

An hour ago, my logitek wireless keyboard MK320 began making errors. For example, I hit the 'u' key and '4u' appears. I hit 'e' and my firefox browser opens. I've rebooted, unplugged and plugged in the USB wireless, checked that I'm using a US Keyboard. Nothing changes. Any suggestions?

 

logitek wireless keyboard problems

It's might be time to replace the keyboard. Is it under warranty? If in the UK you have up to 6 years in consumer law to claim a refund or part refund or replacement. You could ask Logitech support for ideas.