htacces empty

Hi,
we’re running premium version. Today our website went down and and got 404 error on all pages except for the home. We found that .htaccess was empty.
Logs shows this edits at the same time:
52710805 4 drwxr-xr-x 62 apache apache 4096 giu 16 09:47 ./wp-content/cache/all
1046046 0 drwxr-xr-x 2 apache apache 6 giu 16 09:46 ./wp-content/cache/all/prodotti-2
51136187 156 -rw-r–r– 1 apache apache 157616 giu 16 09:47 ./wp-content/cache/all/index.html
34481115 0 -rwxrwxrwx 1 apache savespa 0 giu 16 09:46 ./.htaccess

Should it depend on wrong configuration?

Thanks for support
Antonio