The issue is Virgin router is really poor with wireles signal and make it worse the Sky Q will only connect via 2.4g unless you have Sky internet. My Virgin router and Sky Q box are only 1ft apart so its connected via wire and its perfect.
Since the 1st lockdown March 2020 Wi-Fi at homes been congested and the Virgin router does not help. The short answer is either connect them via cable or spend about £60 to £70 on a 3rd party router to boost the Wi-Fi around house.
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M200 Oomph - 5GB SIM + 3 extra SIM family plan - BT whole Wi-Fi - Sky Q
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Don't cry over Virgin price increase instead speak to retentions team and negotiate a better deal.