RDP and QOS

Hello everyone,

I'm working as a tech support for an ISP. A client, only on 1 site, has issues when RDPing. They connect to servers inside their MPLS VPN provided by us. On their 8Mbits/s link, the QOS in place reserve up to 30% with a shape at 7800kbits. Everytime they download a 15Mo file from a mail, RDP sessions are dropped tills it ends.

The class where the RDP is doesnt have any drops in it, I only have some in the default class. Still my sessions are dropped.

Where can i look at further ? I want to try everything before escalating the ticket.

Thanks in advance for you inputs.