You need to be in Router mode to run samknows realspeed. Also VM will ask you to use Router mode before they will do any checks.
Try checking with Area faults on 0800 561 0061 or if you have a VM landline 150 as small local faults are not listed on the VM status page.
Post the power levels, Pre and PostRS errors and network log from the Hub. Also setup a BQM to monitor your circuit www.thinkbroadband.com/ping
Once done we can comment.