i suggest you contact their live support. i'm still glad my site is still up
Thanks for your suggestion.
I just do a live chat with hostgator support. They managed to solve my 2 blogs issues in second.
I do ask for the root cause and they said is the wordpress post updates sometime can cause issues.
However, accessing to my blogs still slow. I do ask the support about this and he said is ok as he run the loading test from his side.
Anyway, my 2 blogs are up back and running now.