Norton internet security won't stay on

Can anyone help me?  I'm not real computer savvy.  I have used Norton security for years, and have been using Norton Internet Security 2009 with updates for a few years.  A few weeks ago I got an e-mail that my subscription would be renewed somewhere around November 23d.  I also got an offer for a free upgrade I think? Until my subscription renews.  I took it and all was fine.  I don't know if this is related, but as of 6 days ago, my Norton security won't stay on.  Every time I turn my computer off, or just leave it idle for maybe 10 minutes, Norton turns off & I get a message that I've turned it off.  I have to click on to reactivate it.  All is fine as long as I keep moving around my computer, otherwise it goes off again.  Also my computer has restarted several times without me telling it to.  Can anyone help me?  When I finally got a phone number for Symantec I was told my the thick accented foreigner that I would need to buy technical help.  Today I signed up for one of those online help places that takes over control of your computer to find & fix the problem.  He kept doing stuff but my computer kept turning off & on while he did stuff so h e never  did finish nor e-mail me later.  As I said, it has never turned off while I was using it, only if it's off or idle, but it kept doing it to him.  What do I do?

Can anyone help me?  I'm not real computer savvy.  I have used Norton security for years, and have been using Norton Internet Security 2009 with updates for a few years.  A few weeks ago I got an e-mail that my subscription would be renewed somewhere around November 23d.  I also got an offer for a free upgrade I think? Until my subscription renews.  I took it and all was fine.  I don't know if this is related, but as of 6 days ago, my Norton security won't stay on.  Every time I turn my computer off, or just leave it idle for maybe 10 minutes, Norton turns off & I get a message that I've turned it off.  I have to click on to reactivate it.  All is fine as long as I keep moving around my computer, otherwise it goes off again.  Also my computer has restarted several times without me telling it to.  Can anyone help me?  When I finally got a phone number for Symantec I was told my the thick accented foreigner that I would need to buy technical help.  Today I signed up for one of those online help places that takes over control of your computer to find & fix the problem.  He kept doing stuff but my computer kept turning off & on while he did stuff so h e never  did finish nor e-mail me later.  As I said, it has never turned off while I was using it, only if it's off or idle, but it kept doing it to him.  What do I do?