Possibly, Faulty RAM often causes these kinds of issues.
What you did was the right thing to do and you did what was called Re-Seating the RAM (Unplug and plug back in).
If it still works perfectly I doubt your RAM is faulty it could just be because it was slightly loose or something like that.
Check over the next few days to see if any issues arise. If you do have issues I can almost guarantee it's the RAM and it is pretty cheap to replace so I would not worry about it.
So overall I doubt your RAM is faulty but check over the next few days to see if you have any issues.
Regards, Kliqx