Surface Pro 3, about 18 months old.  Lately the clock will (apparently) randomly show incorrect time. For example this morning on startup it is 8 hours and 26 minutes behind.  Two days ago it was 16 minutes slow.  Battery is fully charged and never was discharged more than 50% during that time.  In settings I have it on "set time automatically" and "set time zone automatically".  Any idea?  Thanks in advance.
				
			 
	             
 
		 
 
		