My issue is related to the internet connectivity that I have seen repeatedly in the 64 bit patch and yes I have reverified my files.
Issue: If your internet connection disconnects even for a millisecond the game will be disconnected without even trying to reconnect. The game will go into 'reconnecting' spam and the messages will be repeated very quickly as compared to 32 bit version but will not actually reconnect to the game. Attached screenshot of one such event.
Situation: I sometimes switch to my mobile hotspot to play coh2 since it is more reliable than my broadband, there is an issue with my mobile hotspot, it would disconnect all the connected devices for like 0.5 sec and then reconnect it. So it would go like 1 connected device > 0 connected device > 1 connected device (within a span of 0.5 to 1 sec). So in 32 bit version when I used to play on it, it would do this anomaly and I would get reconnecting message in my game and after 2-3 repeated messages of reconnecting it would reconnect to the game and bring me up to speed. In the current 64 bit version this hotspot anomaly happened today again, the game went into reconnecting message spam but never reconnected, this happened 3 times with me today so I don't think this is a fluke. I was watching steam chat to know if the internet had disconnected for good but it was still connected without any issues.
Also I got a bugsplat too after a sync error match.