At least if it comes back again you've confirmed it as a likely cause if it stops it for a few weeks.
I had similar with a front ABS sensor that I was convinced couldn't be faulty, as it's the only one I've previously had cause to change! Sure enough after 5 years and some copious fiddling I had to accept it was getting worse. New sensor and been perfect since!
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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