Our awesome engineers are always keeping an eye on the reports we receive whenever your game unexpectedly exits - thanks for sending them by the way, keep it up!
Recently, we've noticed one of the most reported causes is related to when an error occurs inside of programs that display an in-game overlay while playing - most notably Mumble & Teamspeak.
This error can then cause the RIFT game client itself to crash.
While we'll always do our best to improve the game, on occasion third-party programs & AddOns do play a role in instability. If you experience regular client crashes, we highly recommend disabling these overlay features to see if this resolves the problem.
As always - our support team is available should you require further assistance. You can reach them at https://support.trionworlds.com