4 cheep sensors could be the problem, buy a front one and try it could be one method, if that does not work .... move on .
the fact that the front and rear faults are mirrored is a clue, and will depend on what type of sensor is fitted,
If you have a scope have a look at what you get from the front right at 30 mph you should be able to do this on a jack , as this sensor looks like the worst offender .
you could also try unclipping the 2 front sensors from behind the CV joint and drive it and see if you get a increase in road speed on the scan tool when the fault happens .
if you do it would suggest a wiring fault and not a sensor/ reluctor fault
Strange fault ,
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