I have a strange situation here where Unity usually hangs every *second* time I start the player from the editor. So, the first time I click Play, it starts normally, the second time I click it, it hangs after a couple of seconds. This is a pretty heavy-duty project, with a lot of network communication, asset bundle loading, complex game objects are spawning regularly, so it could be anything. I've tried attaching the VS debugger to Unity, but when the hang happens, I never see my code in stack traces, so I presume it always hangs in Unity-specific code, not in C# scripts. The editor log doesn't help. This is Unity 2021.1.25f1 (and I can't upgrade due do other Unity bugs, described at https://forum.unity.com/threads/importing-project-hangs-on-2021-2-4f1.1205206/) Has anyone tried to debug Unity itself and see where it hangs?