I once had the same problem
I talked with octagon support and octagon engineers and they was very kind to help me.
For problem - Network Failure:
- the receiver came with an old image from october 2018. I update the image but the network problem appeared when power failure.
- i reflash with image from 23.05.2019 - same problem: network problem appeared when power failure.
- i reflash again with image from 28.05.2019 and now receiver works ok, the network problem does not appear yet.
so do not update, but flash the latest image from openAtv and everything is ok.
I ve made test and it is ok for now.