I am getting this error consistently (reproduced 6 times in a row) after approximately 1 hour of letting my game run in editor. I was using 2019.2.5f1, then upgrade to 2019.2.21f1 to see if that would solve this issue. Packages involved are: collections, mathematics, jobs, burst. They are all updated to latest versions. The main components in my game are unity terrains and Vegetation STudio pro. I am in contact with the author of Vegetation Studio, but he believes this error could be due to either a bug or perhaps some internal memory cap that unity might be reaching. Here is typical performance: There is small hiccups as a new terrain detail batch is loaded, but mostly it is consistent. The only consistency I can identify with this error is that it happens after about 40-60 minutes of running the game in play mode in editor. I have tried reducing the total amount of terrains by 50%, but this made no difference in performance, and the crash/error still happens. Any advice is appreciated.