Bike not changing gears

Over the last couple of weeks (before firmware update to .43 and after) my bike has started having an issue where the gear shift doesn't do anything. 

My power and data is working ok, connected to Zwift, via BT and Ant, the gears just get stuck and the resistance of the bike stays the same. 

If I unplug and leave it off for over 1min it comes back but then tends to happen again shortly afterwards?