If it's a Windows machine and over 6 years old, it's obsolete already and time to replace.

I trash all but one windows unit, windows when compared to Apple like model T to corvette.

Another vote for Jacob's Computers in Wildwood. He is a good guy, does good work for a reasonable price, and above all is honest.

Definitely sounds like a heat buildup issue. See if any vents are clogged. Do you hear the fan kick in, and then it crashes? If you have enough time while up, change your power settings to lowest efficiency, low power consumption. Also might be a setting in the CMOS for saving power or reduced performance. Always use your PC on a hard surface. Place a fan under it and see if you get a longer run time. If so fan or clogged air vents.

Computer repair
 

I have used PC Planet in Leesburg after trying two other places. They solved my problem with two computers, and the cost was much less than what I was paying at our former location.

Trade it in at the Apple Store

There are a few clubs in the villages that may be able to help you. I did that a few years ago. He ordered a new battery and installed it. Wonderful people who live here.

There are many good suggestions on this site on who to go to, to solve this problem.
Before you move forward price them out and decided is it worth getting it repaired or purchasing a new one.
Unless you're a gamer or need a computer with all the bells and whistles, you can get a new one at a decent price.

OP:
If your computer is older and has Windows 10 operating system, you may be near the practical end of your computer’s life. Microsoft plans to end support for Windows 10 in October 2025 (link below). Older computers may not be capable of installing and running the Windows 11 upgrade. In those cases, Windows 10 computers overall will still operate but face increasing risks of viruses/cyber attacks/etc and problems with hardware interfaces such as printer drivers.

Bottom line: You might consider buying a new computer.

End of support for Windows 10, Windows 8.1, and Windows 7 | Microsoft Windows

You don’t have to go anywhere. Jon Townsend will come to your house!
He is incredibly talented, fair and very nice.

He has been doing this for over 15 years here in The Villages.

Give him a call at 352-638-2348

Hi: Recently had a similar problem with my Dell laptop. Check the battery and see if it is fully charged. I keep mine plugged in all of the time and the battery was nearly fully discharged (only 2% remaining) causing the laptop to shut down. The fix was to plug it in to a different outlet, let the battery charge up and then all was well.

Best Buy Geek Squad

My wife has a Lenovo, has multiple screen issues with a Lenovo docking station. Screens going blank randomly, she is constantly unplugging, replugging in cables. . .

why? the off the shelf brand monitor is not a Lenovo is the only answer we can find, and its more than one docking station tested. . . . with two monitors, one cable is an HDMI, the other cable has to be the old IBM L shaped video . . .

just a pain in the ass. . no thanks with the chinese laptops

Another vote for Jacobs. He does great work.

Highly recommend MMD Computer in Lady Lake.