Volume Down Rocker Not Working topic

Hey guys, I'm a long term lurker to XDA's Forums, but had to make a new account and share a problem I'm having..
Long story short: My rooted Nexus 6's 'volume down' stopped working.

I've only had the phone for about 6 days now, so I've begun making contact with Google in hopes i can just send it back... But it's bothering me enough (worried about warranty) that i thought I'd ping this community too about the scenario.

I'm quite certain it's not a software issue because (sadly) the volume-down button doesn't work at boot either (preventing me from getting in the recovery mode).

As per what I've done:
I'm still using the stock firmware.. I've unlocked and rooted it (as you know already), and just installed (and configured) Greenify, Light Flow and Titanium Backup. I did not freeze or uninstall any apps; i just backed a few up that have complicated configurations. I even got the paid versions of them all to help support the work of the developers (not that it matters). I have not installed Xposed (alpha) or any custom recovery tool (CWF or TRWP) at this point.

Today i installed BusyBox Pro too but never did anything further. I can't be sure when the actual (down volume part of the) rocker stopped working because i never really paid much detail to this until it became evident today, I know i needed it to unlock the phone 4 days when i first went through with the process so it stopped working somewhere between then and now..

Suggestions or Advice?

Play Store Download Progress bar issue and Volume rocker button topic

Hi,
I'm facing two issues

1. Everytime when i download from Play Store the progress bar is not showing its download % in notification drawer. Anyone else facing this issue? You can find it in attachment.
2. Sometimes when the Music is playing, if i press volume down or up button, volume gets reduced/ increased but it never displays the volume indicator(dialog).

[Q] Volume rocker stops working topic

Has anyone else noticed that for some strange reason, the volume rocker doesn't change the volume level?

It happened for the first time on my new Crystal today, and did before with my old one as well. On my old phone it was that it would stop working and would work again after turning the screen on and off. Now with my new one, it didn't start working until I restarted the phone.