GPS on and OFF signal

Hi! Im running igo primo 2.0 on my Chinese headunit running wince 6 for a week. its been working fine if the gps got a signal. the problem happens when I turn off the headunit and leave for few mins, it wont save the right time. what I noticed is that when my calendar(time,date,year) is wrong, I have no gps signal. but when it sync to the car time, my gps signal is full.any advice and suggestion why this is happening.

When you turn off the device it loses the signal to the SD card. So all save information regarding time and date is gone until you get a satellite lock next time. This is normal behavior.