My phone is automatically switch off after 1 and half hour

Try booting into your bios...
Google how to boot to bios (Manufacturer / Model number)
e,g How do I boot to bios on Dell Precision T3500
Try a hard drive test from there. Sounds like a hard drive error.
'preparing automatic repair' should end and give you options to troubleshoot if it isn't getting that far test hard drive.

you go in setting and change time and date after half an hour any massage geting related time or is internet connectivity contineu or any time related sofware is instal which sync time automatically via internet

You posted under Leviton 6124 programmable timer.
If this is not your timer, add a comment
Leviton 6124 manual:
http://waterheatertimer.org/images/6124-manual.pdf

If you have different timer, look at link below to help identify timer.
Leviton Timers:
http://waterheatertimer.org/Leviton-timers.html

Leviton 6124 timer instructions:
Timer comes with plastic protector over display >> remove protector to see display.
Large button is manual override.
After timer is wired, push override to make sure Load turns ON and OFF.

Timer has 3 small buttons located below manual override used for programming
Display is divided into 24-hours with am times on left and pm on right.
24 Hour day is divided into 1/2 Hour segments
Each 1/2 hour must be set for ON or OFF

Start by pushing left-side event-cursor-advance-button and it scrolls down each 1/2 Hour.
Once you arrive at 1/2 hour > make decision if you want timer ON or OFF for that half hour.

Press event-set-reset-button in center to set ON-OFF for that 1/2 hour.

Press center event-set-reset-button and solid black rectangle fills in for that half hour.
Solid black rectangle means timer ON for that 1/2 Hour.

Once solid square is selected, press event-cursor-advance-button and cursor advances again and starts filling in black rectangles for each 1/2 Hour period.
Keep filling in black rectangles for all times you want timer ON.

When you reach 1/2 Hour period you want timer OFF, then press center event-set-reset-button so that no black rectangle is visible for that 1/2 hour.
No black rectangle means timer is OFF for that half hour.

To set current time, use right-side time-advance-button.
Press and hold time-advance and time cursor advances down through the am and then pm hours.
Stop cursor at current time, and timer is ready.

univarsal box se flesing kare

I had the same problem. I had the phone on when I called to set up initial service. After activation I left it on (it was charging) and tried to set time and date but couldn't get anywhere. Finally, I turned it off (hold "pwr / end" button till it turns off). When I turned it back on I got a message that time and date were now automatically set. This was about an hour and a half after intial phone call. Don't know if that wait time had anything to do with it.

Try reformatting it.

On a dipslay phone press "Feature 59". It will display the release of the system. LEt me know that.

for this prob. there r 2 resons
1- ur n73 may be infected by viruses. (format this by *3770#) by the lock code 12345.
2- Second one is cmos cell which is in the pba of ur n73 mobile. it will be change from nokia care or by any professional.

amit singh (service eng.)
samsung mobiles
kanpur
india

Replacement from the same batch had the same problem. Sales person then found me one from an earlier batch - no problem with this one. Still don't know what is wrong.    

maybe ther is a shortage on your cellular phone.