The last 2 times I've tried playing a game online it's ended in the game crashing or desyncing (I'm assuming that's where all the other players disappear and I'm facing a bunch of enemies who don't do anything with a bunch of allies who don't do anything).

The first time I noticed I had desynced (2v2) because no one was responding, and I could spend resources so much that I had negative credits, crystal, and metal at some points.

I was playing a 5v5 last night, and apart from a bit of lag, there wasn't much trouble, but I noticed a few times throughout the game negative resource values, even if for only 1 or 2 seconds.  At the end of the game, the enemy was surrendering, and I heard the victory music, but my game froze, and then I alt+tabbed out and noticed some kind of a dump error (I forget what it said exactly).  I confirmed that the game was over with my friend who I was playing with, but this is the second time in a row that I haven't been able to get to the end of the game with my allies.  None of the recorded game data is available to watch, presumably because of these errors.

Is there something I should avoid doing to prevent this, or is this a bug that needs to be fixed?

Edit 2: Diplomacy v. 1.011

Edit:  My system specs:

RAM: 4 GB

Processor: 2 GHz duo-core

Graphics Card: Mobile Intel 4 Express Series Chipset Family

OS: Windows Vista Home Premium 64-bit SP2