[Nexus 6 Q&A, Help & Troubleshooting] acf150:
My nexus 6 just died last night. Got it about a few months after it first came out from eBay since it was a nightmare to find anywhere else. Only thing I did was unlock the bootloader incase I ever wanted to customize it. I never did. About a couple weeks ago and all the October and November security updates before the official marshmallow update but still no marshmallow while on T-Mobile. I started noticeing some weird behavior on my nexus 6. Like not being recognized by any pc when before I would just plug it in and the window would pop up asking me what I wanted to do with it. All of a sudden it wasn't recognized by any windows pc anymore. Searched all over the web for a solution and saw a lot of talk about installing or updating the drivers. I tried everything I could think of. UnInstalling, installing different drivers. From different sourceslike Google's Dev's website using the SDK manager, Motorola's official website, here on xda, asking some of the nexus reviewers and modders from YouTube, etc etc. All to no avail, I then decided to call MOTOROLA and they opened up a ticket for my problem. Then I started seeing a red Android on the top left side of the phone which said comm server has started. Don't know what that was about. Also something called cqa or something like that also started showing up. Usually when my battery was low. When I'd click on it I saw it was an app which is in the fastboot area which when opened shows 3 different options. I guess it's for testing stuff on the phone. I don't know but I also noticed a new file in my file browsers sd card which was a log. Can't remember the exact name at the moment but it was something like sq_log.txt when I opened it up I didn't really understand it but I did notice it had yahoo in there somewhere. I tried deleting it but it would just come back. I remembered my yahoo mail had recently updated so I uninstalled it and the log.txt went away. Don't know if any of this has anything to do with each other but this all happened in the same time frame. Make a long story shorter than what it is last night I was watching a YouTube video without the phone charging and it turned off on me. I thought I'll just charge it when I get home and I'll be fine. When I got home I put it on the quick charger for about an hr and noticed it wasn't charging. So after that I tried starting the phone and it looks like it tries to but it has no charge. It did the Google logo boot loop thing and looked like it was about to turn on than just died again. After a while I saw that when I plugged it in to the charger a green led would flash which I never enabled or saw before. So I've tried everything with no success. Now it's headed to Motorola to hopefully get fixed. I'm glad I still have my nexus 5 as a backup phone. Same thing happened to me with my nexus 5 last year. Only thing I don't like about having phones with non removable batteries. Even though they are removable just a little pain in the ass. Oh well we'll see what happens, don't know if it had anything to do with all the updates for marshmallow without actually being on marshmallow. Still on 5.1.1 with October and November updates?? Who knows or maybe the battery just died and it was giving me clues that it was low on juice. I don't know all I know is it was driving me crazy trying to figure out. We'll see what happens when Motorola gets it. Never saw the led on before this but you could say my phone is pretty much bricked. $750 phone makes me feel like crying. Always had a protector case on it and treatead it like a baby but that's electronics for you. Just thought I'd share that with xda. I'll come back with the outcome.