What I found out is that because I have a larger phone (Samsung S20Plus), the wireless coil for the charger and my phone don't line up well when I have a phone case on. Therefore, the wireless charge isn't consistent. But, once I remove the phone case (where the phone will sit lower on the stand), the charge will be consistent. As for my wife, she has S20 with case and she doesn't have any issue with her phone.