If you look back in the helpforum to around 22 Nov you'll find a few threads on this subject. Several people including me have had the same problem. You'll see the software developer is working on a fix for it.
Surface Pro (2017) vs Surface Pro 4
Where HTML5 is headed next
MacBook Pro v Surface Pro 5
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.