I have a Akarui e50d dry cabinet. I'm not sure if it's working fine. I turned it to M, and the power was on. It was maintained at 40-50%. However, after a few hours, I think when RH value is reached, it auto off and it goes back to 35%. I thought it was not working, and I adjust the settings, the light was turn back on and the meter start moving. Any idea why would it be like this?