Time going to all dashes....

Anyone have this issue or know what could be causing it? It has happened 2x over the last week to me. The time display on both my CD player/radio as well as on my center display (in between the speedo and tach) will all of a sudden show simply 4 dashes with the flashing second marker. Both times, I turned off the car at night and all was OK, but in the morning I then noticed that my time on both displays was showing this:

--:--

It will let me set it back to the time with no problem, but after doing it once, 2 days later, it happened again. Anyone have any ideas or similar experiences?
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2007 Z4 3.0i Roadster
 
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