

It's this. If you have a food shortage in the settlement then your garrison will leave.Probably a shortage of food in that settlement

Same issue again.
Due to prosperity and food... Non cities/castle can handle garnisons.
A day or another every units you put in are going to die. You can only count on militia to keep your fiefs.
This sucks a lot and have to be corrected as soon as possible
Theres a mod for that already if you're interested
