Server stability is something thats being worked on, which means some crashes might happen. Various things can be the reason of it, yet its hard to tell, it takes data mining to figure out what was the cause, more time to code a fix or just a random crash from overcapacitating/deadlocking. Aside from schedules reboots, crashes are impossible to detect and given the fact that trusting random players or staff with 0 knowledge about server maintenance (Me, for example) is not something you'll see in any game. Its a very delicate process. Long story short, its not uncommon to have server issues in early beta mmorpg games, none the less, they will be worked on as soon as they happen.
With all due respect, you really don't need to know the reason, it happens from time to time and it will be worked soon after. Literally making a new accouncement for every crash is just unnecessary spam. Plus, only shane is the one who fixes those issues, meaning that its ok as long as he knows.