I have recently purchased my first draytek router after having a problem with my bt one

I bought the router for a cafe and when i set it up its works for a short time then seems to constantly reset itself

I took it away and set it up in my head office and it worked fine for over a week

I then took it back and put it in the cafe again and its resetting again

The only features i am using are the standard setup wizard and the wifi, nothing else

The only difference is that in the cafe i have set up a wifi password and at the head office i didnt, also in the cafe get alot of different users that arnt there at head office

Does anyone know why the router would spontainously and constantly reset itself

Could it be suffering from the Android Jellybean / HTC One issue that affects the 2850? There's a beta firmware for the 2850 that fixes this issue, but I'm not sure if there's a corresponding one for the 2920 you could try.