It is difficult to predict if it is from one source. It appears to be set up so at times in the day that it makes it look like demand has dried up IMO. Over the last month there have been substantial T trades on around 80% of trading days. These trades have varied from 10 - 50% of that day's trading volume that was posted during trading hours. Not sure what is the motivation for this activity, but it has been going on fairly consistently and appears that someone has an agenda IMO.