I have: iMac 3.06GHz Intel Core i3, 4GB RAM, OS 10.7.5.  It seems that a few times a day, the internet turns off and I need to turn OFF and then ON. There has also been about 3x in a week where everything freezes and I have to power down.  What can I do?

What can I do to find out what's wrong with my iMac?
Internet keeps shutting down. I have to turn OFF and then ON. Sometimes, I'm just browsing the web, sometimes on Facebook and lately it happens when I'm on Dropbox uploading.
A few times while editing photos on Lightroom or Photoshop the computer will freeze and I can't do anything but power off ..
What can I do to see what's wrong with my iMac?
Thanks so much!
T

Hi! Thanks for the reply..
No, I do not get any prompt whatsoever.. I can move the mouse but cannot click on anything.. Just frozen screen, can't close a window, can't click on apple symbol on top to try to force quit an app.. 

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