Self noise and beeping
Hey Guys,
I'm new to audiomoths. I just purchased two. I'm trying to figure out a case situation for them. I designed and 3D-printed a case and discovered that I get noise and beeping if I try to record while the Audiomoth is in the case. I've also found that the beeping and noise happens if I try using a plastic bag as a case.
The beeps look like this.

Is this a known issue and has anyone else experienced this? Both audiomoths do it and they only do it when inside a case.
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Sandisk Extreme (red and gold) also tend to be quieter than Sandisk Extreme Pro (red and black) for some reason.