Since when you are facing this issue and what was the last thing you remember after which you see this happening?
Also, let me know they way your are uploading your site, is it via HTML or direct FTP upload?
The problem periodically appears and disappears. Now she again appeared, and about 2 months is not corrected. itself is usually held.
This can also be due to the flaw at hosting server.
Please try to check with them once regarding this issue.
No. The reason is not with hosting( Look pls websit intsa-wow.ru