Hmm... when I logged onto my VPS just now, I saw that MT4 was no longer running. After restarting it, only two out of the five charts still had the EA attached.
I guess something -is- wrong here... I went into the logs folder and saw a new crash folder, but nothing was in it. Possibly because it got cleared after restarting MT4, so next time it happens, I'll check that folder before restarting. I could however see that the folder was created about 8 hours ago, so I guess that's when it crashed... (which is strange because that's before I made my previous post here, and I checked my MT4 right at the time of that post)