Beacon's running out of fuel without warning

I had 13 weeks or so set up on 3 main beacons that cover the front/centre/back of my build. I fueled each not long ago, but one of them has decided that it wants to give up leaving me with an ashed area, and one late notification telling me it’s already run out…
Where was the notification telling me sooner that it was about to run out?
And why were the 13 weeks over in one afternoon?

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