As expected that the problem which Paypal IPN has failed is because of the hosting setup itself, so I decided to moved into hostgator after 3 days of un ending hopeless support from exabytes engineer. When the shop is running at hostgator, there is no more problem. All working just fine, the shop the mail, just at the moment I still have a lot of things to upload back to make it normal. All styles in vb3 demo forums etc.
Previously I moved from Godaddy to exabytes.com because Godaddy got malware, But then exabytes has a lot of problems(downtime especially) and when my shopping cart stop working I think this is it. No point to stay. Enough for the problems for about 5 months.
Hope to continue business as usual very soon,