Anyone faced this problem before?

My Astro (normal not byond) set top box is located close together with the unifi equipment, and two channels (CNN and another one which I can't recall now) are having "corrupted image" problems (basically unwatchable). All other Astro channels worked fine.

After a bit of consideration I decided to just test it by switching off the DECT (Motorola) phone power, and suddenly those "corrupted" channels started working 100% again.