Audio & visual glitching

[JMettyear]

Switched on my Sky Q box as normal and the audio and screen keep glitching occasionally. Like a quick flicker where sound and vision will go. More the sound than picture. Have resd to change audio settings to normal from Dolby digital plus but i use Atmos for audio. And screen settings are full UHD. Tried a reset on the box and also software update and nothings working. Happens on both general sky and also apps. Please help thank you