Hey all!
I have extremely GREAT news for everyone who plays on our community.
I have just fixed the crashing.
PROBLEM:
The reason why the crashing was happening every 6-7 hours was because a plugin we used called "McMMO" was constantly raising the CPU usage for every player and would keep rising until you restarted the server. The computer that is hosting recognizes it so it crashes the server to bring down the 100% Usage. But even though the server is crashed the CPU usage still stays at 100% and fries the computer until it overheats and shuts down and rolling the server back a couple minutes.
SOLUTION:
I was reading on the bukkit forums why this was happening. I came across a thread with our same exact problem. They said it was something to do with McMMO incompatiple with Permissions 3.1.6 which WE use. I made the downgrade from 3.1.6 to 3.1.5 Which has succesfully fixed our problem and fixed the crashing.
Sorry for the type-o's I was writing this in a rush of exitment