Here's one: Playing as Minamoto with, of course, the short-term goal of uniting Japan, I just got through fighting about 70k+ rebels (Minamotan Nobles, I believe) that were spawned mainly through events. I was about 11 over my infamy limit (people say it's okay as a daimyo, though), had 0 stability (also through an annoying series of unfortunate events), and about 20 Legitimacy due to a Regency Council ruling for my underage leader. The thing is, most of my provinces still had very low revolt risks, and again, these rebels came in the form of events, rather than the normal dialogue box that pops up when there is a rebellion...the text was something like, "The nobles of Yamato have grown tired of the Shogun's incessant warmongering, blah blah blah."
This text made me think it was due to my infamy limit, but being 11 over was a major improvement, as I started at about 20 over after annexing Taira, and many, many years passed with no rebels, then BAM. It started with like three of these events consecutively in about 6 months' time, then about the time I was taking out the first small stacks, three more events happened, and then over and over and over and over again (it was way more dramatic than this in the game). I had a stack of 18k that I was using to take care of this problem, as the way things were going, I didn't want to spend my manpower for more units (and I couldn't afford them financially, really, as I became more and more blockaded).
Four loans later and I was finally getting the upper hand on all of them, slowly taking back territories and eliminating rebel stacks here and there, when the game decided my nation had collapsed (it hadn't, I had things under control damnit), and I assume it took my final remaining loan (if this dialogue popped up, I missed it, saved and quit right after), to pay the rebels off and return me to peace.
I know this is more than a quick question, but I figured this was not really worthy of a whole new topic...and my biggest question is why did this happen? Like I said, I'd had astronomically high infamy for years, had 0 stability many times through the incredibly annoying daimyo events...though, my legitimacy was incredibly low due to the underage ruler...so maybe a perfect storm of all three? I'm just trying to figure out how to keep this from happening again, as I put a lot of work into this damn daimyo, and this came out of nowhere and just about ruined it.