RDP session crashes after 30 minutes

Dear All,

Following situation:

- Horizon View Client 3.1 with Yosemite

- connecting to a physical desktop Windows 7 64bit using RDP

Approximately after 30 minutes the RDP sessions crashes and the only way is to force quite the Horizon View Client.

When the same client connects to a virtual desktops it doesn't crash.

Any idea how to resolve it?

Thanks,

Edy