Why won't phone let me use tool bar, lock screen or home and menu bts?

I can't access the lock screen, use the home and menu buttons, or access the full tool bar unless I use it right after I turn it on. The rest of the time no matter how far I slide it down it doesn't go beyond the partial one. Even after completely shutting off my phone it still won't show the lock screen. (The sleep mode option doesn't show up in the menu that pops up when holding down the power button.) I've tried everything from booting it to safe mode to resetting the settings to uninstalling apps that could be the problem to even turning on accessibility mode to no avail. My phone first started doing this after I turned it back on one night after accidentally turning it off while on the charger and it's been stuck this way ever since. What's more, I can't download ANYTHING, so no SuperSU or home button app to remedy this (I've never had SuperSU or apps of the like to begin with). The only button that works is the back button. The other two light up and make a noise, but don't actually do anything beyond that. Please, PLEASE help me. I can't take this anymore.

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