FBI - Self Assessment

We frequently get error messages about the log file not being found so the tax return doesn't actually get submitted. Also sometimes it can take ages to get a response from the Government Gateway. This is really worrying as it's only July and we've been getting these problems since the end of April! For the "Log file not found" error message HMRC are blaming our software and our software supplier is blaming HMRC. Our IT department have tried everything and checked all internet connections etc our end. Are we alone? If not has anyone else found a solution? (other than manually filing)
Helen Crowley