[Vive Wireless Adapter: Official User Guides]

I found that disabling the camera resolves the issue for me as well.

[Vive Wireless Adapter: Official User Guides]

I'm running into the exact same issue as MajorJebus.  It happens a few minutes after starting any game.  I tried several things including removing the USB drivers and resintalling the components, switching the PCIe card from a 1x to an 8x slot, and switching between SteamVR Beta and non-Beta.  Unplugging and replugging the USB cable between the battery to the wireless adapter on the headset brings the headset back online.