Think of breaking spokes like making popcorn.
The first kernel to pop may do long before the rest of them, later on a few more pop, then later yet the bulk tend to pop in rapid succession.
Likewise with spokes. A single failure is indicative of nothing. Have it replaced, true the wheel (and check overall tension which I consider part of the job) and go on your way. Make a note of when it happened. If a long time passes before the next failure still no sweat, replace and retrue. But if the next break happens fairly soon, you might be headed to the time when your popcorn is ready.
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