Currently for my 6 S7 speed is 20 THS . It is same for many weeks now.
It is getting worst day by day.
Li If you think you want to go out of Hosting business let us know rather than we are in limbo where we do not have any clue.
If the issue is with S7 quality then issue has to be for every S7 not only to S7 which was supplied to you.