After your warning I have one more time checked add on panel, yes /public_html/ is being created automatically but panel gives option where I can remove /public_html/ ( rename ). Please see secreenshoot at the attachment.
I have already renamed one folder ( deleted /public_html/ ), it is also working there.
Now for this problem occured domain ( nannyturkey.com ) I prefer to wait untill problem repeats again. Last 40 hours did not occur a problem and I amstill obsorving it.
Or should I change directory ( remove /public_html/ right now ) ? What do you recommend?
Sorry, i can't help more.
This is more likely a hosting problem, since Osclass doesn't suffer from all that.
Since this is getting hairy, please ask your hosting for more help. They know better.
For me, when i create a addon domain, i can put whatever as Document Root. You say you can't.
Anyway, waiting will not solve your problems, praying also that they also don't come back will not help. I mean .... if you don't get rid/solve those FATAL errors, you wont' be ok.