OnePlus 2 Froze and Crashed During Boot; Now Won't Respond

64GB OnePlus Two running OxygenOS.

Backstory of the last time this happened:

A while back, I was on Snapchat when all the sudden my phone just froze. Didn't think it was anything special since it does that not too infrequently, but then the screen went black. Again, wasn't too concerned because it has done that before as well.

It began to reboot as normal, but right when it got to the final stage of the boot animation it froze and rebooted. This time it stopped toward the beginning the the animation and rebooted. On the third boot attempt, it showed the "optimizing apps" message like the Dalvik cache had been wiped. Again, up to this point it was nothing new (I had crazy problems with the latest OxygenOS before I rolled back to 2.2.0) so I wasn't horribly concerned.

But at about 120/160 optimized, it froze on that screen and crashed. And that's where I am right now. No matter how long I hold down any combination of buttons, the screen will not come on and it fails to otherwise respond, with two exceptions.

I tried the hard brick recovery method, but no amount of holding volume up would get it to show up in device manager.

When I went to bed last night I decided to give it one last shot. Held down the power button for a sec, and it vibrated and then powered on. Went through the whole "optimizing apps" routine and started up just fine. It was reallllly sluggish and laggy for a few minutes but now seems to work fine. Only thing I can guess is leaving it plugged in for a few hours had some effect. Oddly enough, it was at 98% to start and was plugged in doing nothing (that I could tell) for a few hours, but only showed 86% when it booted.

Well, it happened again. When it happened the last time, I rolled back from OxygenOS 2.2.1 to 2.2.0 since that seemed to be the only change I had made recently. I'd left it stock till now, but I decided I wanted root and Xposed so I flashed TWRP 3.0.2, SuperSU 3.65, and Xposed. When it rebooted after this, it froze during boot and shut off. Now it won't do anything. Holding volume up won't make it show up in device manager on my computer for the hard brick recovery, and leaving it plugged in for ~20 hours didn't help either.

Please help! I'm an extremely busy engineering student and finals are just about a week away followed by flying home. I really need to fix this ASAP.

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