Keyboard and trackpad intermittently working

Hello,

I have a macbook 8,1 A1278 i5 2,3ghz model. I currently am running it without a battery, previous one swole up. Sometimes the keyboard and trackpad stop working (they show up in System Profiler tho). They work fine at startup, when holding alt key and selecting a dive, but once it is in the system, they don’t function even though they are detected. Grabbing the device fixes the issue tho and it works fine.

Any idea what may cause this issue is appreciated, thank you