Good evening.
I would suggest than you may have an intermittent charging problem, the most likely suspect being the regulator/rectifier.......However, when you say that the charging system checked out ok do you mean that the voltage across the battery was at least 14.5 volts at 5000 rpm with the lights on? A visual inspection of all the associated connectors & wiring is worthwhile doing, as many a perfectly good regulator has been replaced, only to find out that the fault was a dodgy connection.
Cheers.
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