Recently installed FG in a replacement machine; but while I successfully evaded Edge, neglected to delete Bing from the start menu.
ERJ would mysteriously go down at some point in flight while using autopilot and route manager.
Caught it in the act: thrust reversers were automatically deploying.
Seems something to do with Bing would toggle delete in the ERJ, at some point during the flight; thereby deploying the thrust reversers. When I removed Bing from the start menu, the problem left completely; but I'm unsure why.
Have since changed thrust reverser toggle from delete key to "111", o. Also disabled Cortana and news notifications.