I have been using Aptana for years now, and have become accustom to its many features.
It has been reliable up until I upgraded from Xubuntu 13.04 to 14.04.
Now
I maybe jinxing myself by posting this so soon, but I have gotten Aptana to run stable for about 30 minutes.
What I did was disable the Show information on hover event.
Turn it off by going to Window->Preferences->Aptana Studio->Conent Assist and setting "Show information on hover" to Off.
If this doesn't fix it I will report back, but so far so good.
Credit: Aptana closes unexpectedly