I do not have the same problem when I put another EE SIM card in my phone so it’s not my handset.
It happens a lot at home and anywhere in London to be honest, I haven’t travelled outside of central London to know if it’s just an issue there. Regardless I need my phone to work without cutting out in London, I pay for a service and this is a joke!
My partner does not get the same issue with this and he lives with me, but is not with virgin.
I do not have Wi-Fi calling set up