Have just upgraded to fibre (which wasn't without signficant problems). Now it's working I have noticed that when uploading files (eg photos to Flickr) the download speed (on every connected device - wired & wireless) is reduced to near zero.
In fact, when uploading files, attempting to use any internet based application is totally useless until the upload has completed.
There was never a problem when we were on ADSL with a DLS-3780 router, so why is there now such a significant problem?
This occurs on any device (PC running Win 10, Ipad, Itouch, Android).
I'm beginning to wish I'd never been persuaded by TT to upgrade to fibre - it's a huge retrograde step compared to ADSL.