Restart after Sleep

A couple of days ago I attempted to upgrade my Macbook to Snow Leopard.

Prior to doing this I increased memory to 2.25 gig.

The upgrade failed because I had the wrong disc. (I am now getting the right disc, but that is a separate issue)

Since I returned to my 10.4.11 each time I close the lid (or manually put the computer to sleep) it goes into automatic restart when I open it again in the morning.

In addition it is now necessary to Start Safari, Quit Safari and restart Safari before it will connect to the internet.

Any ideas where I should look to correct these issues.

Thanks,

Steve B