I constantly get this error and it's doing my head in. A box reboot always temporarily resolves but how many times a day should I have to reboot? My wifi is rock solid for all my other devices (Amazon Eero boxes dotted around the house so mesh wifi). Never had any problems with SKY-Q and wish I could go back but I'm under contract.
Just to clarify i have 3 V6 and a Tivo box in my household and I get the same issues on all of them. Every time following a reboot it always works on at least the 1st attempt. TV's are Samsung The Frame 2020 model, a Samsung UE55KS7000 and also a small LG set and a small Samsung set (I'll get the model numbers if you think that will help but as it occurs on all 4 TV's across 2 manufacturers so I don't think its that). Video output settings are approriate to the TV with two being 1080P sets and two 4K.
All Apps work fine when run from the TV operating systems such as Netfilx, Prime and Britbox. Problems only ever occur when running through the virgin boxes and before Virgin I was running SKY Q across a 2TB box and several mini boxes quite happily.