Intermittent Sunrise/Sunset Timing Issue

I've run into a regular occuring intermittment problem that I can't seem to work out.

About once a week RM4 rules that rely on sunset/sunrise seem to fire no matter what the time. Its currently happening right now.

Sunrise is at 6:48am where I am located (Geelong, Vic, Australia).

My hub correctly sets out the location, timezone and sunrise/sunset:

The current time now is about 8:30am (well after sunrise). My rules that rely on between sunset and sunrise are currently show that it is True (between sunset and sunrise) when it isn't.
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By way of example the rule shows it triggered at 08:18am despite not been within sunet / sunrise (though the rule says it is).

As stated above, this happens about one day a week. All other days the rules sunset/sunrise run fine. I just can't peg down why this happens roughly one day a week. A reboot of the hub solves the problem and everything is back to normal.

I don't think it is a case of the hub just failing to adjust at sunrise as the problem seems to begin occuring at about 2am. For instance, I have a rule that logs presence to turn on/off lights if presence sensor detects Poppy arriving home between sunsent and 22:00 (note time is currently showing true even though its not currently between sunset and 22:00

Yet the rule started firing at about 2:06 am and thereafter intermittently throughout the night.

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If anyone has any ideas what might be the intermittent culprit I would be grateful.

Cheers