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Check developer options (if you had enabled it) and check if the "Don't keep activities" option is ticked. Untick it. If it is unticked, or you had not enabled developer options, check available RAM. You might had used too many apps and the system restarts the homescreen every time. This happens to me when I play heavy games like Asphalt 8 and/or using the camera extensively. Restart the phone if the available RAM hits 100 MB or below. I do it almost twice a week. The .17 update consumes much more RAM than .14, in my experience.
Restarts don't help? Try to do a software repair via PC Companion.
Have you tried wiping your internal storage? I mean zero. Dunno if this would help, though.