The site going down is a multi-part issue, some of the work and additions we are including can have plugin memory leaks
They set up triggers when they identify them to reset the system before it crashes, but sometimes a new plugin, update, or change causes a problem just like with any computer
They investigate each crash, they look at the root causes, if it's a hack they can see it, and either remove anything they attempt to drop in or, the server guys just roll back to the time prior to when it happened.
Do they try to hack us, every friggin day, almost every friggin hour from many places for a variety of reasons. The biggest reason is traffic, any hack in a place that has traffic is ripe for it. You being here is reason enough, it's practice, it's financial, it's a dozen reasons at any given moment
But most of this just conflicts between different plugins and software updates.