Twitchy Droids

I've been analyzing the original on Blu-Ray. Did anyone else notice that Ash was drinking white fluid in the movie? I thought it was milk but then I got to thinking why would an android need to drink milk? First thing that to came to mind was he was faulting or developing a fault thats why he had to "rev up" prior to sitting at the console when they disembarked for the derelict. I mean could he have sprung a leak during hypersleep? Then that begs the question did he even sleep the entire time they were in hypersleep? What about when Ripley was interfacing with MU-THUR then her and Ash got into it a little bit. I think he biffed his head on the wall and knocked what ever was loose completely off causing his mental reasoning faculties to deteriorate. So here's some side food for thought if this is 30 years prior and there's a droid or 2 in Prometheus, does anyone think a twitchy droid is going to have a huge impact on the movie? Also there has to be different droid manufacturers. Any opinions or ideas on what I mentioned above about Ash.