What's very possible is that one wire came loose, as in it wasn't tight to begin with (ask how I know...brand new Axis, no dash air). You may need to remove the receptacles, 1 by 1, and re-tighten the screws. It's possible that the wires were stabbed in the back of a device and it came loose. Y'know, for your peace of mind that would be good to do anyway. I'd replace the most used ones, like the kitchen because the spring grip inside soften up with use. Pretty cheap insurance.
BTW, GFCI receptacles do fail and need replacing too.
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