Left shift key intermittently stops working

[Thinkpad2024]

Every once in a while, my left shift key stops working. If I reboot, it starts working again, or if I just restart Windows Explorer (from the Task Manager). I think it's happening when I press some combination of keys, rather than being dirt under the key. Any ideas what could be causing this and how to fix it?

I'm running Win11 24H2 on a T14 Gen 2.