60 cents worth:
I reckon someone tried DIY calibration and stuffed it up,
or unit was put in that mode by accident and random WTxxxx! button pushes and panic dial rotations knackered it
or the bearded supercrapacitor is causing havoc whilst in circuit
or combination of both above, and one beer three many..
You will not get a better all rounder 'user friendly' meter, with 100khz AC performance (!!) = it's worth saving
or sell or donate to someone who will give a go
These items do not belong in the landfill for a while yet,
nor should be subject to 'dumpster it' clueless corporat decrees
Surely there must be some 'out of warranty' Fluke specialists in the U.S. to send it to,
for a fix and cal quote