Call the technicians at the factory.  My VI+ had a problem where the crystal slowed down and finally died altogether.  I got a replacement and excellent detailed instructions on how to calibrate the clock.  Now it's dead-on all the time. 
 
        73, Duane  AC5AA
 
On Mon, 15 Oct 2001 08:02:37 -0400 "John Huffman" <hjohnc@core.com> writes:
My used Omni V seems great in all respects.  But, I do notice the clock loses time, a couple of minutes a day.  I've tried 2 new batteries and it still loses a bit of time.
 
Anyone else noticed this?  A cure?
 
TIA es 73 de K8HJ
John
 

Duane Calvin, AC5AA
Austin, Texas