Slow load of message body

Download of message headers are ok, but then the body of the message is not there and the download indication line at top of message screen cycles for various time periods. Also getting indication of message server disconnect occasionally. I have seen this problem with eM Client in the past and seems to occur after version updates. It gets corrected, and then recurs with subsequent updates. I have not had this problem with other email programs. I hope this will not force me to switch.