Phone is possessed. Pls help

So, a few weeks ago my phone started randomly saying that my Sim Card wasn't installed. I think nothing of it and just restart my phone each time. Then, the night after that started happening, I was laying in bed at like 8 pm, and my phone starts playing this random ass 80's song I've never heard in my life. The second I turned my screen on, it stopped.. So I went in and uninstalled literally every app that wasn't essential. I also checked to see if I had any processes running that could've caused it. Nothing. A few days later, sometime in the middle of the day, it starts playing ANOTHER random song. But this one was spooky as **** sounding. Samething happened, stopped as soon as I opened my screen.


Skip 2-3 weeks to today, nothing has happened, no sim card error, no music.. my phone is working as normal, I'm out riding on my motorcycle with my phone mounted on it. I decide to stop and turn on some music (connected to my Bluetooth headset) and the second I unlock the device, it freezes up. So I start just pressing the screen, trying to swipe. Then it says "Google App process has stopped responding" (or something along those lines), then says "System process has stopped responding". So I hit the power button, the screen turns off but it won't turn back on. I finally take the battery out and put it back in. I boot it up and I notice it says "Custom" and has a unlocked symbol underneath it. My phone seems to be working fine now, but what the **** is going on.

Halp

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