Hi David, I might be able to help. How old is the laptop, because if it's a few years old, it could be overheating. The cooling fans may have stopped or are clogged with grime, dust and dirt. That will certainly cause it to run slow and shut down. This would require a tech, if you don't think you can take it apart and clean the fans, ducts and heatsinks out yourself.
The People's Guide
to Android in the People's Republic.
Honorary Grand Poobah Shenzhen University English Corner.
There are nine million bicycles in Beijing.
There are nine million Androids in Shenzhen.