Mike,
Thanks for all that. I have done all those things you mentioned numerous times, with the exeption of the shutdown proceedure. I am running the iFly 740. It looks like you are using a tablet? Your EFIS display looks different than mine, and it sounds like the menu system is different as well.
Recalibrating the AHRS is easy if it is connected. I just tap on the artificial horizon on the map, and it gives that option. My issue is it loses wifi connection. I know it is the Stratux, because I monitor wifi on my phone, and that is what disappears. I have reflashed cards many times, and like you, started carrying a spare in the plane. I can't do it in flight, though, due to where and how my Stratux is mounted. Even if that were easy, it is not important enough for me to mess with it in flight.
I appreciate you giving me the proceedure for shutdown. On the 740, "MENU" gives an "Exit Application" option instead of "Shut Down." Then you can choose whether to "Run in Background" or Shutdown the GPS Application. I have never seen any options for shutting down Stratux. However, when I get the Stratux in hand with the 740 next time, I will look again to be sure. The only thing I know I can do is go to Network Settings in the 740 and tell it to disconnect from Stratux (or any other WiFi it is using.) This does not shut down the Stratux, but just breaks its connection to the 740. Which iis what happens when it screws up....... The Stratux red and green lighs are still on, the fan operates as needed, but it is not communicating with the iFly. Usually if I shut off power to Stratux and restart it, WiFi connects again and it works for a while. But not always.
In fact, I don't think the 740 has Wifi out, so may not be capable of telling Stratux to shut down? The 740 never shows up on my phone or computer when searching Wifi signals. If I am wrong here, someone let me know.
Anyway, thanks for the response and your efforts, Mike.
Gary