What has gone wrong, and what has been done to fix it :

1.  There have been periodic lag-spikes, where everything done in game reverses itself.  I'm purchasing a new host today that will be much more powerful.  The new host will have an SSD, a top of the line processor, and most importantly will be on a host that has more available bandwidth.

2.  The Portal Gun mod started throwing exceptions every time a certain player logged into his base, causing the server to restart.  I'm looking at you, Shablo5.  The mod has been removed at the server level : this means that all portal gun stuff has disappeared.  Since the client still has the mod, you won't crash when opening chests that used to contain Portal mod stuff.  I know some of that stuff was expensive, and I'm sorry that I had to remove the mod.  

I'm really sorry I wasn't awake when all this happened : it took me less than 30 seconds to disable the mod in a config file.  As the server grows, it appears I need to deputize more people with authority to handle issues like this.

On the bright side, that's the ONLY mod that's been crashing the server, and for teleports we have other good solutions.  Can't afford 2 million energy a teleport?  We also have a mod that adds high speed rail.