Hey /wsr/, I've been having trouble with my computer for

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Hey /wsr/, I've been having trouble with my computer for years now and I'm finally running out of ideas. I've kept the thing on life support but for the last couple days it's been brutal.

Let me explain what's wrong. Since 2014, my laptop has had a strange problem where it will freeze at random intervals. Sometimes it's because I move it or adjust the screen, sometimes it could be because I so much as breathe within a 500 mile radius. These aren't brief freezes either- I have to shut it down by holding the power button and restart.
Curiously, there would be times where after restarting, my computer would refuse to connect to internet or even acknowledge that any wifi exists at all (a red "x" icon where the wifi bars would be). It would take multiple restarts before it would reconnect again.

I have theorized that this is because of either the battery or the disk. Battery because I've had this thing since middle school and little me was stupid, not realizing that keeping a laptop charging 24/7 overcharges it. The disk because when it freezes, the disk light goes out and it occasionally does a disk check when restarting. Never finds a problem, though.

I do what I can to keep this thing alive- always making sure my drivers are up to date, scanning for viruses, cleaning off dust, etc., but for the last few days the freezing has got really constant, with its wifi connectivity issue in tow every time.

Is there anything I could do to at least reduce this problem without replacing the hardware? I can't afford to replace anything right now and if I have to do that I might as well just save up and build a better computer lol.

Pic supplied is a screencap of specs. It's an HP Pavilion TS Sleekbook 15, otherwise known as a "toaster."