@Fbmowner, if it's an issue cased by the SteamVR process, than you should look to your SteamVR system report to see if it's captured. Windows error reporting services may also capture the error.
Overall, it sounds like you have a pretty non-standard setup including overclocking, 3rd party SteamVR dashboard and compatibility apps, and 3rd party accessories which include both hardware and software elements. Every single one of these may need to be scrutinized for you to find the root issue - Hopefully it's just easily visible in SteamVR's logs but this kinda sounds like something is leaking memory or that a process is hanging - potentially SteamVR itself as it shuts down the compositor.
If the issue ends up being in the SteamVR/TPCast integration, you'll need to contact them for assistance.
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I'll give you a sadder story. I have put together an ITX beast machine - to be semi mobile. It's designed for both a VR development and a live performance. It cost me months of work and thousands of USD. I have recently returned a complete and fully functional Rift + TP Cast, thinking I was making an upgrade getting the new Vive Pro (with the Knuckles and inhouse wifi module I hoped). But since the initial disappointmement of not being able to even run the headset without all the accessories (unavailable separately atm), I also found out the wireless kit won't do, as my ITX motherboard simply doesn't have a second PCIe slot. So TPCast is my only hope to ever even think of running the Vive Pro wirelessly on my rig. That, or going back for Rift and saving another few thousand bucks. I still have two weeks to decide, but I've got to tell you, looking at the VIVE Pro sitting here like a paperweight, each new wasted day makes it less and less appealing.
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