Brymen BM235 strange EF-detection failure

[jogri]

Today i discovered a rather strange problem with my 235:

When i turn on EF-detection and hit/slap the top of the meter lightly (where the antenna sits), it "detects" a EF-field, showing bars and beeping. Funnily, this corresponds with the high/low setting: If it is in "high" mode, all four bars show up, together with the beep. However, if i switch to low sensitivity, i get only 2-3 bars and a beep. It just beeps a few times and then shuts up until i hit it again. I have not yet tested if it still detects EF-fields, since every time i held it against a wall, it beeped. Did anyone encounter the same problem and knows how to fix it? Not that i would need that function more than once a year, but it sure is a nice thing to have.

(Did i treat my multimeter that bad that now it starts crying every time something bumps into it? Yeez, i should tell it to buck up...)

[malagas_on_fire]

Well what about known sources such as live wires, a socket  does it fail at all or does it make repeatable tests, eg same distance  vs sensibility. Try also with extension cords. Do you have an NCV pen?Some of them are very sensitive devices and can pick some electrostatic charges.. eg rubbing in a dry towell or cotton t-shirt,
[Edit sorry for my poor english :S ]

[jogri]

It does still detect ef-fields, the lowest i could find that it detected was a laptop power supply at standby (.35W). I think the circuit is still fine, but since it is now shock sensitive i can't use it to run it across a wall...