Cbe Pc180 Van Battery Reading?

I have a CBE PC180 fitted to me van and until now it has been working well.
During the last two trips I've noticed that as the day goes on the panel starts to show a flashing light beside the van battery readout. If we press the button to show the battery level it seems to have fallen into the red zone without any real warning (two red bars).
We have a solar panel fitted with an LED unit fitted which also shows battery condition and that is still showing the van battery to be full.
Next time of use the van battery is showing full and no issues.
Any ideas?
Is this anyone else's experience?
Cheers.
 
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