Wireless charging stops after a few minutes of charging

I bought this for the wireless charging capability. I was disappointed that when using wireless charging, it will charge for a few minutes and then it stops charging. You have to continuously check on it to make sure the charging has not shut off. I bought three of these. One for myself and two for gifts. Then I ordered a forth one for another gift. All four have a the same problem. I would not buy again.

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