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BM869S not reading correct voltage

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LDDM:
Hi Everyone,

First post here. Some time ago, I bought a BM869s after watching some videos of EEVblog on YouTube. The first one I received had a leaking battery, so I was sent a second one and was never given a return label for the first one.

Long story short, I repaired the first one and had 2 brand new BM869s. Both of them were working perfectly for 1.5 years of really light use (for hobby project). However, the last time I used them, for some reason, both gave me incorrect voltages AC and DC.

At first, it was with AC voltages from mains power (230V). I measured between Live and Neutral and only got around 156V (now it is 0V). I did the same with another multimeter (Major Tech brand) and I had the expected voltage (230V to 240V). Then, I tested with my power supply (RD6006P) a DC voltage and had the same issue: I got lower voltage than expected (please see pictures below).

Has anyone had this issue? Can it be resolved, or is the multimeter fried (both have a similar issue)?


Please also see video here: https://youtube.com/shorts/29_wXrWJ6-4?feature=share

Fungus:
It seems impossible that both would fail simultaneously. These are very robust meters.

There must be some information missing.

LDDM:
Maybe I did something wrong by accident, but these are not the first meters I've used, and I've never managed to break a meter before. Additionally, I did not do anything unusual with them, only measured battery voltages, voltage in small circuits (ESP32, Arduino, and similar), and very few times mains voltage.

What could cause this sort of issue?

(Note: The first meter with a leaky battery also had an issue with the amp jack sensor, which I fixed.)

LDDM:
I just found someone with a similar issue, it seems:

https://www.eevblog.com/forum/testgear/brymen-bm869s-no-longer-reading-ac-voltage/msg5529979/#msg5529979

Update: Also find this (I'm having this issue as well)

joeqsmith:
I bought my first one in 2016.  Even after all of my abuse, both meters continue to work fine.  For two to fail, there's more to the story.

Switch point hunting is a common problem.  Agree, it should never happen but it's not something that has ever caused me a problem outside of the reviews.   The BM789 should be solid in this regard. 

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