T17 got hashrate but cant see it in the farm


I added my Antminer T17 to the farm and it has been online and mining for one day now. I turned it off and then started it again and now it doesnt show up in my farm. I can connect to it and ping other things on Internet.

Whats wrong?

Edit* I flashed again with my farm image and now i can see it in the farm again. But why do i have to flash it every time i turned it off och reboot?