I run AC 2 separate settings both using 8.2.4: in office a peer to peer network the 'server' is a windows 7 pro machine, it happens daily when connected wirelessly on a Surface Pro 2 running Windows 8.1, can count on it crashing daily usually after lunch???; other setup is in nursing home running Windows 7 Pro on ThinkPad laptop the laptop houses the database in that setting happens less frequent