so i bought this tablet for my mother for christmas and i had to check on everything; charging, battery etc. I set the time and timezone already to my GMT etc.BUT THE PROBLEM IS when the tablet sleeps or shuts off, it always resets the date and time to 8AM Jan1,1970. why is this so? i dont wanna go back to the shop cause it's kinda far away and if it is just a software or setting issue then i hope that i can just do it myself. help please cause im about to wrap it already as christmas is already next week!! thank you!