Why does my phone occasionally have a black screen while vibrating?

Sometimes when I have my phone charging or in sleep mode for a while (usually not longer than 4ish hours), the phone screen will be black and unresponsive and the device vibrates. It's one long, continuous vibration and the flashlight also turns on.

I am unable to restart it with the power button and the only way to stop it is to remove the battery, then reinsert the battery and turn it on with the power button.

I've had this device for about 5.5 years now and it has been dropped a few times and was repaired at a shop after a shattered screen in 2019. Does this sound like a hardware or a software problem? I'm worried it will stop working before I can afford to buy a new phone. Any and all answers are appreciated!

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