Strange Audio Issues on Nexus 6 (T-Mobile)

I've been having audio problems on my Nexus 6 for the last few weeks after attempting to Root my phone. I've since unrooted my phone and performed a factory reset and I'm still having these audio issues. I'm starting to think this may be an audio issue.

1) When I receive a phone call or when the alarm on my phone goes off, the volume is very low. Raising or lowering the volume doesn't help
2) When I try to accept a call, I can't hear anything, but the person can hear me.
3) When I try to place a call, I can't hear anything, but the person can hear me.
4) When I'm in a call and I put my phone on speaker, I can't hear anything, but the person can hear me. Right now the only way I can hear anything while in a call is when I'm using headphones.
5) The audio volume goes up and down sporadically when listening to music, watching videos, or using an app that has audio. When I'm using an app, eventually the audio volume will drop by half. To fix this, I have to switch to an app that has landscape mode and put the phone into landscape mode. Eventually though the sound volume goes back to being very low and I have to put it back into landscape mode for the volume to go back to normal levels.

Any help would be appreciated.

Phone Info
32GB Nexus 6 on T-Mobile
Android 5.1.1.
Build LYZ28E