My question is where can we start troubleshooting this ... it almost sounds like the connection changes from time to time during the day (i.e. from a high speed connection to lower speed connection - not sure how that works on a cloud server). We have our cloud vender looking into this too as is the vendor of one of the sites we are downloading from (Site1). One of the vendors mentioned that they've heard that WinSCP has been having some issues with sftp lately, but as mentioned earlier we see this with ftp too. Are there any areas that we can look into?