I have been using Antergos (Desktop friendly Arch) on and off for a while. If you haven't updated for a while, it could cause problems. After I updated after staying off it for two months I had an x crash. Restarted, no problems, all updates installed.

Chris from LAS does say I believe in User Error 6 or 7 that if you don't update Arch in a while you could have stability issues when you update.