i have a problem on my teg. 94 RS, the clock on the dash is not reading the correct time. first i adjust the clock time and when iam driving a car the time still correct but suddenly the clock read 1:00 , i dont know why, but each time i drive a car and the radio is on after some moments the time goes to 1:00, and the radio still working without any problem on it even on the radio clock disply it still read the correct time..when i adjust the dash clock it keep read the correct time till the next day,when i turn the car on still correct then after moment goes to 1:00, can any one help me?

thanks in advance