Did you tried the built-in list of IPTV Channels ? Do these give you the same problem 1% or only the ones you talk about ?

As if all do the same then it's an image or connection problem in your side, if only these do that problem then it's the IPTV service links you use that are not working properly.

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/