Only some keys work on bluetooth keyboard

[AMSOS]

Hi all. I got back my Macally keyboard from a friend who used it for about a month without any issues.

When I tried using it on my setup I notice that it behaves oddly. It hooks up to my laptop (ext monitor+wireless mouse) fine, but only some keys are working. This means I am able to press some but not all letters and numbers.

A random check suggested this may have something to do with mouse keys in accessibility but turning that on/off hasn't helped.

My friend uses a Mac Air (older model) like me. Their OS version is older (10.12) than mine (10.14). They reported no issues with typing. The other difference was that they use a regular wired mouse, while I have a Logitech trackball mouse. Not sure if this has messed up things.

Thanks in advance for your help!

 

[Fishrrman]

Time for a new keyboard.
And DON'T lend this one to any friends...

 

[AMSOS]

Time for a new keyboard.
And DON'T lend this one to any friends...

Oh. Really? Is there nothing I could do to get the keys working again.
I've had this for several years and cared for it. It's never seen a serious spill.
When my friend used it, all the keys worked fine. Can several of them stop working just like that?
Could this not be some complicated software issue?
Thanks!