Default [Q] Samsung galaxy ace GT-S5830 keeps on rebooting

My Samsung galaxy ace GT-S5830 keeps on rebooting whenever i switch on 3G and hotspot together, its not very frequent but atleast once in a hour. The frequency keeps on increasing day by day.

Any suggestions on troubleshooting, and to check the system logs to find the root cause of the problem, Recent days i havent installed any new tool