Got similar issues, took me 1 hour tu reconnect the solarflow. Had to reset my router wifi settings (does resert to to the same exact settings, anyway) and then change the wifi name to another than the previous connected one, then reset the solarflow and use the new wifi name, if I use same wifi name it will fail to connect. Extremely annoying. Smart meter in my case tho connect wells automatically, even after turning on and off the router.