Computer spams “Q” key, but only when num lock is on

Hello! I have a Lenovo IdeaPad Flex running Windows 10 Home. It’s a couple years old at this point. About a year ago I had an issue crop up where I couldn’t use the keyboard, as it kept randomly spamming the “Q” key. I pulled key caps off and cleaned everything, but it didn’t make a difference. There was nothing discernible that I could see affecting it. I even did a factory reset to see if it was a weird software issue. However, that didn’t fix it, it continued spamming q.

I eventually gave up and used a USB keyboard. Since I wasn’t able to disable the built in keyboard through the device manager (it kept re-enabling when the computer would restart), I had to put it in tablet mode to use the USB keyboard without the button spam continuing.

However, after a few months, we realized that the laptop keyboard randomly started working without spamming q, and through trial and error, I realized that it was only happening when I turned on num lock. However, once the Q spam starts, I cannot turn num lock back off on the laptop keyboard. If I plug in the USB keyboard and turn num lock back off that way, I can then unplug the usb keyboard and then continue using my laptop keyboard normally.

I have no fucking clue why/how num lock being on could be causing this issue. I am mostly curious to hear if anyone has theories that could explain this or if there are any tests you’d recommend doing.