Alt+Tab keeps stopping then arrow up and down keys also

I just installed…

Manjaro 21.1.6 Pahvo
x86_64 Linux 5.13.19-2-MANJARO
KDE 5.87.0 / Plasma 5.22.5
KWin
Breeze [GTK2/3]

Alt+Tab keeps randomly stopping working. I have to change to another open application window and then press and hold down Alt+Tab keys and then after a few seconds it will start working again. When it stops working I am then also unable to use the arrow up and down keys which I notice in the Terminal trying to recall previous commands.

I did that TTY2 test from the log-in screen and I don’t think I have a keyboard hardware problem… but is there anything else I can try to debug this?

Cheers,

Flex

Did you update and reboot the system after installing?

Yes and it says my system is up to date.
I’m beginning to think it’s a hardware fault. Sometimes when i hit F12 on boot up to get in to the BIOS the up arrow key isn’t working. Just now I booted in to Manjaro but could not respond to you because the keyboard was not working at all… no keys working. I did a reboot and now they are working again.

Flex