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I sleep in VR and for the past couple of weeks using the IK 2.0 beta I have been crashing randomly right after I wake up and move a little bit. I think the crash is related to trackers / controllers trying to attach themselves back to where they are supposed to be but due to the nature of the crash it has been impossible to reproduce on command.
My completely uneducated guess is that some hardware event or Windows is reseting USB devices or drivers crash or something else is causing stuff to restart or reconnect, and VRChat is trying to use the device while it's not ready. I have no idea why this seems to mostly happen right after I move after sleeping though. I have disabled all power saving modes from Windows, USB devives and SteamVR.
Note that I don't think this is limited to IK 2.0 beta and live version does have similar looking crashes if you are using IKTweaks. I'm reporting this here since my experience is from IK 2.0 beta and it also has at least some information in the log. Also just to clarify, these crashes happen without using mods, using IK 2.0 beta and using both stable and beta SteamVR (1.22.12). VR setup is Valve Index, Index controllers, feet and hip Vive 3.0 trackers.
I have had this crash happen to me at least 6-7 times and here are a few examples where I have best info available:
  1. https://www.youtube.com/watch?v=dF-R-BAcpKI
In the video you can see that just before the crash, one-handed movement UI element appears on one of the controllers.
2022.05.24 01:39:24 Log - [IK Debug Log] Immobile status changed to: False
2022.05.24 01:39:35 Log - [IK Debug Log] Immobile status changed to: True
2022.05.24 01:39:37 Log - [IK Debug Log] Immobile status changed to: False
2022.05.24 01:40:25 Log - [IK Debug Log] Immobile status changed to: True
2022.05.24 01:40:27 Log - [Behaviour] OnPlayerEnteredRoom
2022.05.24 01:40:27 Log - Voice DeliveryMode: UnreliableUnsequenced
2022.05.24 01:40:27 Log - [Behaviour] OnPlayerJoined d［-․-］b fb94
2022.05.24 01:40:27 Log - [Behaviour] Initialized PlayerAPI "d［-․-］b fb94" is remote
2022.05.24 01:40:27 Log - [Behaviour] CacheComponents: ParticleSystems 0, AudioSources 0
2022.05.24 01:40:29 Log - [Behaviour] CacheComponents: ParticleSystems 0, AudioSources 0
2022.05.24 01:40:29 Log - Found SDK2 avatar descriptor.
2022.05.24 01:40:29 Log - Measure Human Avatar Avatar
2022.05.24 01:40:29 Log - [Behaviour] Initialize ThreePoint Avatar (UnityEngine.Animator) VRCPlayer[Remote] 41712229 122 (DŽDŽDŽDžDžDžDžDžDŽDžDžDŽDŽDžDŽDžDŽDžDŽDŽDŽDžDŽDŽDžDžDŽDžDžDŽDžDŽDŽDŽDŽDŽDŽDŽDŽDŽDžDžDŽDŽDžDžDŽ) False Safety
2022.05.24 01:40:29 Log - EyeLookController: found avatar type =VRC_TEMPLATE_01
2022.05.24 01:40:31 Log - [Behaviour] Sanity check of remote non-master pair ID 107 and Path ":6B/" passed!
2022.05.24 01:40:31 Log - [Behaviour] Sanity check of remote non-master pair ID 11900002 and Path ":B59462/" passed!
2022.05.24 01:40:31 Log - [Behaviour] Sanity check of remote non-master pair ID 10 and Path ":A/" passed!
2022.05.24 01:40:31 Log - [Behaviour] Sanity check of remote non-master pair ID 35 and Path ":23/" passed!
2022.05.24 01:40:31 Log - [Behaviour] Sanity check of remote non-master pair ID 83 and Path ":53/" passed!
2022.05.24 01:40:40 Log - [IK Debug Log] Immobile status changed to: False
2022.05.24 01:40:59 Log - [IK Debug Log] Immobile status changed to: True
2022.05.24 01:41:41 Log - [IK Debug Log] Immobile status changed to: False
2022.05.24 01:41:54 Log - [Always] [IK Debug Log] [Steam] Device connected
2022.05.24 01:41:54 Log - [Always] [IK Debug Log] [Steam] Device role changed
2022.05.24 01:41:54 Log - [Always] [IK Debug Log] [Steam] Device role changed
  1. https://www.youtube.com/watch?v=Vxg7Y0P3xwY
I woke up, shut off my index controllers to switch to another set, took off the headset and walked away from it
2022.05.23 02:11:57 Log - [Behaviour] Removed player Izunya
2022.05.23 02:11:57 Log - [Behaviour] Unregistering Izunya
2022.05.23 02:13:22 Log - [Behaviour] Pickup object: 'VRCMirror' equipped = False, is equippable = True, last input method = Index, is auto equip controller = False
2022.05.23 02:13:24 Log - [Behaviour] Drop object: 'VRCMirror, was equipped = False' Grab button released, last input method = Index
2022.05.23 02:13:24 Log - [Behaviour] Pickup object: 'VRCMirror' equipped = False, is equippable = True, last input method = Index, is auto equip controller = False
2022.05.23 02:13:26 Log - [Behaviour] Drop object: 'VRCMirror, was equipped = False' Grab button released, last input method = Index
2022.05.23 02:13:31 Log - [Behaviour] OnPlayerEnteredRoom
2022.05.23 02:13:31 Log - Voice DeliveryMode: UnreliableUnsequenced
2022.05.23 02:13:31 Log - [Behaviour] CacheComponents: ParticleSystems 0, AudioSources 0
2022.05.23 02:13:31 Log - [Behaviour] OnPlayerJoined _MasterJJ
2022.05.23 02:13:31 Log - [Behaviour] Initialized PlayerAPI "_MasterJJ" is remote
2022.05.23 02:13:32 Log - IPSs 'High Priority IPSs':
2022.05.23 02:13:32 Log - {{"isEnabled":"True", "releaseStatus":"public", "tags":["high-priority", "user-all"], "priority":"1000", "startDate":"01/01/0001 00:00:00", "endDate":"01/01/0001 00:00:00", "createdAt":"08/21/2021 07:27:05", "updatedAt":"09/18/2021 07:37:29", "hash":"a76e7da333c6a5a8f7ec2adee064cac9", "data":{{"version":"2021.3.4", "id":"VRC.Core.ApiInfoPushSystem+Data"}}, "id":"build-config"}}
2022.05.23 02:13:32 Log - [Behaviour] CacheComponents: ParticleSystems 0, AudioSources 0
2022.05.23 02:13:32 Log - Found SDK2 avatar descriptor.
2022.05.23 02:13:32 Log - Measure Human Avatar Avatar
2022.05.23 02:13:32 Log - [Behaviour] Initialize ThreePoint Avatar (UnityEngine.Animator) VRCPlayer[Remote] 70234521 203 (DŽDŽDŽDžDžDžDžDžDŽDžDžDŽDŽDžDŽDžDŽDžDŽDŽDŽDžDŽDŽDžDžDŽDžDžDŽDžDŽDŽDŽDŽDŽDŽDŽDŽDŽDžDžDŽDŽDžDžDŽ) False Safety
2022.05.23 02:13:32 Log - EyeLookController: found avatar type =VRC_TEMPLATE_01
2022.05.23 02:13:34 Log - [IK Debug Log] Immobile status changed to: True
2022.05.23 02:13:35 Log - [IK Debug Log] Immobile status changed to: False
2022.05.23 02:13:37 Log - [Always] [IK Debug Log] [Steam] Device connected
2022.05.23 02:13:37 Log - [Always] [IK Debug Log] [Steam] Device role changed
2022.05.23 02:13:37 Log - [Always] [IK Debug Log] [Steam] Device role changed
2022.05.23 02:13:37 Log - [Always] [IK Debug Log] [Steam] Device connected
2022.05.23 02:13:37 Log - [Always] [IK Debug Log] [Steam] Device role changed
2022.05.23 02:13:37 Log - [Always] [IK Debug Log] [Steam] Device role changed
2022.05.23 02:13:37 Log - [IK Debug Log] Immobile status changed to: True
2022.05.23 02:13:39 Log - [Always] [IK Debug Log] [Steam] Refreshing tracker info...
2022.05.23 02:13:39 Log - [Always] [IK Debug Log] [Steam] Tracker info for LHR-8B25C148 was updated
  1. No video or log for this unfortunately. I woke up and my controllers had somehow bound to my feet and were acting as feet trackers. I power cycled all of the trackers and controllers and when FBT came "on", I crashed.