Shopping Cart Errors - Please Help

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http://forums.oscommerce.com/viewtopic.php?p=228372#228372
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I have been everywhere (i do believe literally) on the forums looking for a solution to my shopping cart woes.  Everytime I think a post is going to do it for me, I try it (or read on in the thread) and find that I'm still experiencing the same problems. Namely, my cart will self empty.  Not all the time, just a lot of the time.  I can find no rhyme or reason to its emptying.

My session variables are already as Karlin had suggested
[quote]Session Directory /tmp 
Force Cookie Use False 
Check SSL Session ID False 
Check User Agent False 
Check IP Address False 
Prevent Spider Sessions True 
Recreate Session False [/quote]

I have read all the posts and think maybe its my version of Php, which by the way is run on a shared server (thus no control over release).  Can someone please help me so I don't have to go and buy some inferior product.