I too had problems with my GW resetting.
I use custom designed PCBs with Atmega328p-au using the internal oscillator. With some nodes the GW will reset when I turn them on. Sometimes changing to another NRF-module solved it but this time none of my NRF-modules worked so I searched and found this thread. Flashed the GW with v2.2.0-rc.2 and now all my problems are gone.