I have an HTC 10 - HTC6545LVW - I have a significant problem during phone calls. Both when the speaker phone is turned on and when it is turned off. I have a horrible echo and screeching feedback sound during phone calls, it has gotten bad enough where I need to find some resolution. I bought the phone in December, which is way too early for me to be experiencing problems of this nature. Please help. I am a long time HTC ONE user. Please help.