Nowadays some channels with 905 Amlogic are pixelated. I have a Mecool m8s DVB-S Box (same behavior with Alexelec on that box) and a x96mini with the newest Coreelec image.
The Provider is Vodafone Germany DVB-C. (formaly Unitymedia)
Both are showing the same pixel-salad, but only on several (important) HD channels. I tested TVH 4.2 and 4.3.
For instance Sky Sport News HD (freetoair) and the Sky Sport Bundesliga channels (encrypted, tested with local card).
The strange thing is, it worked fine three weeks ago.
Raspberry Pi 3b+ with the newest Libreelec works fine. So it is not a problem with the cable, signal or the provider.
I testet the Astrometa and the Hauppauge WinTV Solo DVB-C Stick. Same results.
I think my cable Provider has changed a little thing and the 905 Boxes are not able to deal with it.
A german user has the same problem.
Here is a log from a fresh installed coreelec 9.2.2 on the Mecool Box.