Yes, some other members could confirm, but I think that at these levels (eg. 1080i), we are reaching the limits of the DM800HD CPU/Chipset/hardware. In other occasions I seen the DM800HD downgrading the image definition in these cases to have a better/smoother stream.

The VEVO IPTV Channels are at 720 and work good on my DM800HD.

TS
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DM8000, DM800se, DM500HD, DM800HD, DM7025, DM7020s, DM7000, DM500s
VU+ Solo, VU+ Uno, VU+ Duo, Kathrein UFS910
Tivusat, TNTSat, Fransat, SSR/TSR, BBC1-2-3/ITV
DE-OpenBlackHole 1.4 image : http://www.openblackhole.com/