Can you tell me which specific model of Earmen you have? Sparrow?got a Earmen DAC for both desktop use and with the phone which Doesn't have 3.5mm port.
This one looks like android driver issue. Some phone OEMs have fixed it, some apps like UAPP bypass the android driver entirely to workaround this issue. I read like some DAC chips manage this issue. Yours may be ESS chip if Sparrow. What @MaSh uses has AK dac chip.
What you may try if not done earlier:
1. Set battery power saving kind of option to low and put the phone on high performance mode.
2. Try enabling OTG in storage options.
3. Try introducing a powered usb hub between phone and dac to eliminate power factor.
4. Try to borrow other DAC to test.
5. Try UAPP app and if not workiing get a refund. Google supports it, cross check with app dev too.
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