Had this happen once, and like you was surprised. But it was a prelude to something bigger that was brewing that took a few years to figure out.
We had a cracked pipe in our main sewer line going to the street and the little guy crawled up the line and apparently drowned or otherwise died the process, that may have taken some time to complete.
So I'd be wary of whats up with your sewer line. It took about 3 years before it all crashed and became known. But looking back we had a soft spot in the yard for several years and it all made sense to me after it happened.
Cost about $5k to put in a new main sewer line.
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