We are currently using Magneto v.18.104.22.168 and have been using onepage checkout for sometime now. Since the use of this page our sales have been volatile with traffic volume remaining the same or better. We are seeing a huge fall-off while customers are trying to checkout.
Looking in our logs it shows customers stopping in and around step 3 of checkout but we have yet to replicate the issue. We feel the page is failing somewhere and certain steps are not opening up and or the progress bar is freezing.
We are looking for a developer who either has experience with this sort of Magento issue or considers themselves as a Magento expert.