I recently got one ( Christmas). Was playing around with it Saturday morning. Finally got it to be seen outside my network which was cool. Not sure how long that last but it worked when I wanted to look at it. Just got the stoker log and am going to try it on my next cook.
When I am in wifi mode, mine never has an address under IP Address. I only get and address in the wifi address (RO).
When it is plugged in with the cable I get info under IP address.
I have used the Stoker app for 14 hours a couple weeks ago and it stayed "connected". When ipad goes to sleep it stopped refreshing data, but as soon as I refreshed it showed me the temps. The graph wasn't being updated of course.
Not sure this is right or wrong but FWIW.
2 LBGE,SBGE/36" Stainless gasser(The BGE Grilling Center),Stoker wifi,iGrill,Thermapen