What you were expecting to happen, and what actually happened:
I expected for the Battle rewards to appear immediately after the battle was over. Instead, I had to wait several minutes and perform multiple retries in order for the Battle rewards to appear. Also, the loading screen is stuck when opening the game, with multiple Retries needed to get into it.
How often does this happen? When did it begin happening?
It started since the 29th of September, and it happened almost constantly.
Steps to make it happen again
Win a battle, then wait a little.
This also happens to me on PS4, since around the same date. Crashes randomly with that message in battle and on the map screen. Usually lose a few sigils per week to it.
happens to me constantly too. if i just say hi in chat, i then have to reconnect before starting or finishing a battle. or ill wait ten min for crap to load. and yeah, been goin on for several weeks now.