Yeah, I've been having this issue as well. At first, I thought that this was just the transition from my monster 1520 to the 950, but its heartening to know that I'm not alone on this.
I've also had the heat issues mentioned, bot during charging and general use. It gets so bad that, while only watching videos, the phone will crash and restart. This happened four times to me today. This was not an issue in either my 1520, or my old 700(?).
Dunno if the usb 3.1 standard is to blame, but I would rather have a slow charge that lasted the day than have to carry around an external battery pack to classes with me.