This has been happening for me for ages: Browser crashes (At least it has consistently looked like the same problem.)
It’s still happening on: Chrome Version 54.0.2840.71 m (64-bit) on Windows 7,
Chrome 54.0.2840.85 on Android 6.0.1 and on whatever version of firefox came before the latest on Mac OS X El Cap.
ETA: on chrome only a tab crashes; on firefox the browser crashes all together.
ETA 2: I should add that the way this has always come about for me is exactly the way the OP describes: by cycling through correspondence games and going to overview page between each.