Need a new Motherboard? Or at least some help

I'm wondering if anyone has a Nexus 5 D821 motherboard in working condition that they would like to get rid of. Or if anyone knows of a way to get into Qualcomm 9008 mode from LGE Android Platform USB Serial Port. The phone seems dead, doesnt react to button presses, Vol Up+Vol Down+ Power doesnt change anything, the phone restarts back into LGE Android Platform USB Serial Port mode. No download mode. From what I know my EMMC wasn't dead (passed all the Board Diag Tests). Phone died after I flashed SBL1 with boarddiag (Even though I was told not to...)

I've had at least 15 random reboots TODAY ALONE.

I've had the phone since mid-March. I've had maybe a handful of random reboots over the course of the last three months. Beginning last Friday, I've been having some really annoying random reboots and freezes. I've tried formatting my sd card, using the phone without an sd card, factory resetting my phone but it's still acting up. I even did the whole reinitialisation process on smart switch TWICE, but it still freezes. When I reset I set it up as a new phone and don't restore anything except Whatsapp from google back up and my contacts.

http://imgur.com/ugcj5Z6 I can't seem to put pictures so I'm only putting links

I'm putting here a link to an imgur album that's a bunch of screenshots from Gsam and you can clearly see when it reboots. This is all just from today.

http://imgur.com/a/9Wkbm

https://drive.google.com/open?id=0Bz...k1WQUVfQVVzSEU Here is a picture of it having frozen with weird miscolored lines near the bottom quarter of the screen. This disappears after I reboot. This happens quite often and where the lines are changes almost every time. It is completely unresponsive and button - volume down button combination to get it to restart.

Here is a video of it being unresponsive and eventually rebooting by itself