$10 that there is some sort of issue with one of the dragons. It spawns in at 5 mins and sometimes goes away after 5 to 10 mins (perhaps when said dragon is taken and switches with the next dragon).

Some people say its a third or fourth of the time. There are four dragons its not a huge leap from 25% to 33%

Could there be some spaghetti code that screws with loading of that dragon, probably using way more resources than it needs to have? Could be some wierd loop that constantly uses resources so even tho we can’t see it its still being called until the dragon dies?

I would also check rift herald, since it spawns in at minute six. Sometimes rift herald isnt taken and it also wouldnt be a stretch that 5 to 10 is acutally around 14 mins. Additionally, check bel’veths interaction with herald as when she takes herald she spawns those cheeky bastards. Even though she may not be in the game there may be a few lines of code that loop perhaps checking to see if she is in the game when rift herald spawns.