As far as I can tell it seems to be totally random. Sometimes it happens over night and other times it just randomly happens from one map to the next during play. For example yesterday I was playing around 11pm and my rank was around 70 then for seemingly no reason the very next map I was at 3000. I am just really confused by this. I hear people in GG server complaining (talking about) this a lot. It is just really frustrating. For us regulars it isn't too hard to get the rank back down again after a reset, but it is really starting to become an irritant after having to work back from 3000 time and time again.....I wish we knew what was causing this instability.......