I sent my HTC one m8 to HTC for repair. The gps notification kept coming on every 5 minutes and nobody had any idea. 3 weeks later, they send the phone back saying they could not duplicate the issue and sent my phone to the wrong address. I wanted to use them bc I don't want a refurbished phone, however, I will not use the service again I don't think. I have no idea if the phone is fixed, but, I will know soon enough.
Good luck.
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