Having gfx issues when i'm playing online. Doesn't happen in career mode.

Whilst racing online, the Vive screen seems to 'pulse' (i can very briefly see the mountains of the Vive VR loading screen) and when it does, I lose the ability to change gear and other driving actions. It's soooooo frustrating, but it all happens very briefly, then I'm back in control and it pulses again.

My hardware is getting on a bit...

Asus X79 Deluxe mobo (2011) (I've had this mobo for 9 years - I know I know I need to get a new rig)
I7-4820k overclocked to 4.3ghz (LGA 2011)
32 GB ram
Nvidia GTX 1060 OC 6GB (standard OC settings)
Running windows 10 pro

1st gen Vive WMD.
Wireless internet connection showing 56 Mbits, with a ping less than 20.