Have three mppt SmartSolar 100/30 units. Two are seeingvthe voltage and temp and one has stopped seeing voltage and temp. I have deleted and reconnected the relevant VE network but no joy. This has happened at some stage in the last few weeks and has worked previously. Also checked for firmware updates and all three in the same set of firmware. At a complete loss as to what has happened and how it happened! Help please and thanks!!!