I have a relatively new laptop that I'm very happy with. It's fast and has a relatively large amount of memory. This leads me to often have my browser open with a LOT of tabs. Odd things happen in both the browser and other programs, especially Excel, when it hits a point where the amount of memory is pushed beyond its tolerance. When Excel gets wonky, I restart and then don't open the browser until after I have whatever Excel wasn't doing right, completed. Sometimes you get a message about not enough memory, but most times not. Just something to be aware of, and to agree with the prior message that says to limit what other programs you have open.
I'll also add that my browser of choice is Chrome, even though it is a memory pig. Sometimes just closing all Chrome windows and re-starting it will fix the problem, if it is a problem in Chrome.
Iris Ailin-Pyzik
Crystalline Systems