Unfortunately this is not uncommon for these older vehicles. There is a capacitor in the radio that begins to fail and when it does the clock display no longer works. I assume that whenever the clock does work the time is accurate? So it goes off and comes back with the accurate time? This shows that it is just the display inside the radio is failing but the memory within the clock is still working.
I attached the info because I suspect you will have to replace the radio to correct this. Let me know if you have questions. Thanks
Images (Click to make bigger)
SPONSORED LINKS
Tuesday, December 1st, 2020 AT 1:24 PM