Default [Q] My phone (Android 4.03) travels in time, why?

Hi,
Anybody knows why my LG Swift L5 is traveling in time? It can change date randomly, no matter is the date is synchronized with my operator or not. It happens once every few weeks, but can be annoying (for instance when my alarm will not wake me up). Anybody has the same problem as me? What can I do to fix it?