Not sure if this is the same error others have reported for the World Event but I was extremely upset in PVP yesterday - I got to Tier 1 and Rank 28 when everything froze and I was forced to restart the game. After restart I was thrown back to Tier 4 and Rank 400.
Took an hour or more to get back to the top 100 and by then other players had progressed past me.
Now I am too scared to even try PVP again.
Platform, device version and operating system:
Mobile (Samsung Tablet)
Happened once on Monday 20 June.
I am a fairly new player so do not know if this is something that regularly happens.
I know this article talks about the World Event and Campaign but it also appears to be effecting other areas of the game for some people like yourself so we are looking at this holistically.