Try a freebie first and pull the front abs sensors. There was a post about them collecting rust since they're magnetic. Clean 'em off and reinstall. All that will cost is your labor.
Might as well check all the sensors' wiring as far as you can trace it and check the tps connection too.
Also check the main wire loom behind the headlight for chafing on the radiator core support, it has been reported as a source of strange behavior.
I don't get the part about it going away for a while then coming back...
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