I just switched to a Samsung Galaxy S7 after using an iPhone for the past 8 years or so. So far my experience has been miserable. The most recent problem is that when I connected my phone to my PC (Win7 64-bit), the PC didn't recognize that any new device was plugged in, although the phone did start charging. I called VZ Protect since I purchased insurance on the phone, and the guy on the other end walked me through enabling Developer Options, which allowed me to change the USB mode from "Charging" to "Media Transfer Protocol (MTP)." Once I did this, my computer recognized the phone, downloaded the necessary drivers, and allowed me to start copying music onto it. Great! ...However, after putting maybe 50 or so songs onto the phone, I suddenly got this error message that said "Cannot copy [name of file] -- The device has either stopped responding or has been disconnected." I then have the option to stop copying or skip the current file, and to apply that option to all remaining files. When this happens, no more songs will copy. (All songs I try to copy are MP3 or FLAC.) Of course, the phone was not unplugged, nor had the screen gone blank or anything else indicating that the phone was no longer operating. I called VZ Protect back and the lady suggested I try to restart the phone (genius idea...) and all we discovered was that when I did that, upon going back into the Develop Mode options, the USB mode was back on Charging instead of MTP. She suggested I go back to the store and swap the phone for a new one because this one is defective. Before going through that hassle, I wanted to check if anybody else came across this problem and, if so, what are some possible solutions? There's really two problems here: (1) the files not copying and (2) the USB mode reverting to Charging upon restarting the phone. Any help would be greatly appreciated!