Has anyone had this problem before?

I will boot up the MP and do some work or whatever it might be. I will leave for a while and come back to the log-in screen. If I leave Safari open with more then 2 tabs open I will come back to a pop up that says are you sure you want to close both windows or something like that. It's like it goes to sleep and reboots or logs me out of the computer. I have had a few times were I left for dinner and come back home find I lost all of my work.
BTW this has been happing for a few months now and I don't remember when it started. Might be after an update? But, I can't remember.
Please help if you can.

I would start with these basics,
Try using Disk Utility to do a Disk Repair, as shown in this link, while booted up on your install disk.
You could have some directory corruption. Let us know what errors Disk Utility reports and if DU was able to repair them. Disk Utility's Disk Repair is not perfect and may not find or repair all directory issues. A stronger utility may be required to finish the job.
After that Repair Permissions.
No need to report Permissions errors....we all get them.
  DALE

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