Question why does my left shift on separate keyboard which is plugged into my laptop not working?

Jun 7, 2022
my keyboard left shift doesnt work, when i boot up it acts like its being held down and all commands act as if shift is being used, but when i press my left shift on my laptop keyboard it works but the left shift on my keyboard is not usable, this problems sometimes goes away for months then comes back and the cycle reapets, this been happening since 2020.