Hi all,
I began to check out Peter E's theory about relations and DOW's, before Johan replied. But I'll still show my findings. Well, I figured that if it were related to relations, than it shouldn't be related to time between reloads. Meaning that if I waited a year before reloading, I should get roughly the same amount of DOW's as if I waited 5 years.
But I found that the number of DOW's, peaces, vassalizations, and other diplomatic actions in the first few days after a reload ARE related to the amount of time between reloading. So if I wait a year, I might get two or three DOW's. On one reload after 5 years, there was close to 20 DOW's, amazing.
If these odd diplomatic actions do indeed mean that these countries have just "awakened", this means that AI's drift off to sleep over a period of time, perhaps after a particular event or calculation (who knows?), and the longer the player waits to reload, the worse it will be.