Sky box major glitches

[Mark45]

Hi there. Setup is Sky Q, plus 3 x mini boxes. Main box hardwired all minis wireless. 
Issue - 1 x mini box glitches on every channel, won't show all 'home adverts' (suggesting things to watch) and often tv guide appears blank. Seems like a network issue. Tv hardware is fine, all cabling fine. Have tried hardwiring this box too, same issue. Shows as connected to network and main box fine. Been fine for years, but passed few months unwatchable. 
ideas please? Thanks

[Mark45]

Ps- have tried all usual resetting network connection, powering down all boxes in order, rejoining via wps etc etc. same - permantly stuttering picture/menu etc. 

[Chodley]

Did you disable wifi on the mini when you hardwired it?

[Mark45]

Yes, I did. Both channels. No difference unfortunately. 

[Tom-W19]

Hi @Mark45 

Your post has been escalated to our Community Messaging team who will invite you to a private chat shortly and help you with this.

Just look out for the chat bubble to start the conversation.

Here's more information on how Community Messaging works - https://community.sky.com/t5/Did-you-know/Escalating-a-post-to-a-Sky-expert/ba-p/3711147

[Lisa-P1987]

Update - Spoken to @Mark45 after some checks and steps, we have booked an engineer 🙂