Remote backup somehow fails but

[LawsHosting]

I can see all the files in the remote machine with the updated timestamp!

Could not read reply from control connection -- timed out.
ncftpput /home/tmp/reseller/username.tar.gz: timed out while waiting for server response.

This error shows against random tar files, eg. john.tar.gz could be successful one time but the next time could give the above error.

Its not the remote machine, as manually mput'ing the files goes smoothly

This is suddenly happenning.

Any ideas?