I have a MacBook Pro Early 2011 (now vintage) running macOS Sierra without any problem whatsoever. However, my trackpad sometimes (very frequently) starts to malfunction or stops to function at all. I am using an external mice without problems. On the keyboard, sometimes [it] starts malfunctioning when I type really fast which I believe it's correlated with the Trackpad issue.
Things I already did: - Fresh install - New Battery - Reset NPRAM - Ran Apple Hardware Test no issues shown.
Theories: - Some electrical charge probably messed up my trackpad and Apple Hardware Test is not showing it (however sometimes trackpad works perfectly fine).
My MacBook has a small dent so the bottom case is not completely closed, could it be that is getting dust, debris or even some weird electrical issue?
On the inside, the Trackpad and Keyboard Cable usually contains this bracket (see pic below) however my my MacBook doesn't have it. Could that be an issue?
Next Steps: I'm looking for some theories as well in here before I actually buy extra pieces as I'm on a budget. Replacing the bottom case with keyboard and trackpad seems to be the safest choice but the most expensive and the bracket seems like the cheapest and quicker way. Please any help is appreciated!