This is beginning to smell like the U127xA all over again.
Their response to that was to change the published specifications and it was, in retrospect, clear that they had no plan to recall/replace these until they got given some stick on here. You'd think they would have learned something that time around and once they discovered this problem would have put a complete plan in place and made complete, cogent and clear details available.
The absence of those complete, clear and cogent details a second time around does immeasurable harm to the Keysight brand. When you make instruments that people the world around rely on you have to act proactively in a situation like this to maintain people's confidence and failure to do so yet again is inexcusable. If a couple of the right stock analysts catch wind of this repeated incompetence after the U127xA debacle then Keysight's stock is in for a pounding.
A half-arsed de-specification of the product is not enough. You need to:
1) Proactively tell all affected customers about the problem.
2) Explain the problem honestly, fully and clearly. People with this kit in production use have to be able to evaluate what action they have to take. People can't just turn production lines off if they are affected by this. At the same time, they also need to know of there is a genuine safety issue or measurement confidence/reliability problems if they do keep equipment in production. And they shouldn't have to waste time and money reactively chasing you to get an explanation.
3) Tell people what you are going to do to fix the problem that you created for them. Are they getting replacements? When?
And, given that we're doing this again after the U127xA affair:
4) Explain what you're going to do to make sure that:
(a) Other recent products in the field aren't going to turn out to have similar problems because you've spent too much time and money changing the company name, and not enough time and money on designing and manufacturing reliable multimeters.
(b) Future products aren't going to be similarly laden with defects that show up in the field.
(c) When or if this happens again you'll move expeditiously to inform customers, promptly explain the problem fully and honestly, and replace any affected products as quickly as humanly possible.
As it stands at the moment I have zero confidence with anything with a Keysight badge on the front of it unless it once bore a pukka HP badge and I know the product hasn't changed in the interim.
Keysight management ought to have figured all of this this out for themselves, but if they can't then I and "Mr. Cluebat" are available at our usual extortionate consultancy rates to explain it to them. Oh, and if you decide to change the company name yet again (after this you may need to) may I suggest "HalveTheSpec".
Yes, I know that amongst the serious stuff I've been a bit sarcastic, but having to say this stuff again can make you feel a bit edgy.