Hey there @Marie_and_mark ,
Welcome to the community and thanks for your post.
In order for the community to best assist, a few more details will be needed;
- Are you using a third party equipment (router, switch, etc.)?
- To confirm, you have access to internet on devices directly connected to your modem with an Ethernet cord?
- When you indicated "The Virgin+ app shows there is nothing wrong with the connection", are you referring to the Virtual Repair Tool?
- You mentioned a brand new phone and iPad, are other types of devices affected (Chromecast, Firestick, smart home equipment, etc.) ?
- Does the issue occurs when closer to the modem (interference)?
- Have you split your Wi-Fi connections into separate bands (2.4Ghz,5Ghz,etc.)?
- Have you got in touch with our technical support team to review your concern?
Looking forward to hearing back from you.