Just to keep you in the loop, I contacted support, provided screenshots of bandwith settings and speedtest results ask asked by the first level support. We'll see. :)

vieldcs wrote Make sure the device doing speedtest is with the highest priority and disconnect all other devices, stop other applications when testing the speed. Try at least 3 times in different at...

I've got exactly (right down to the exact remaining bandwidth) the same problem... latest firmware. Any ideas yet?

I'm having exactly the same problem.. bandwidth down to 35-38 MBps with QoS enabled, with other Modem/Router combos (VDSL2 conection here 50MbitDown/10MbitUp, syncs up great with the Archer VR600) no...