Rider stopped

I was riding today and was about 1.5hrs in to the Uber pretzel then out of nowhere I suddenly stopped moving, it was showing my kickr core was still connected to Zwift on my Lenovo tablet but was not registering any watts or RPM. Went in to the menu to try and disconnect and reconnect the core but no luck. Also tried to unplug the core and plug back in but no change. Bluetooth was still connected as my HRM was still registering a read out. I was on the latest version of zwift and my zwift ride software was also up to date. This happened last week too and the only way each time was to close the zwift app and start again, any suggestions?

i had a similar thing today my avatar stopped for about 40 seconds the off it went very annoying.