Hi Andrew, thank you for posting to bring this to our attention! Sorry to hear of your issues with TV GO.
Would you be able to confirm a few things so we can help establish where the issue may be:
1) Are these all Android / Windows devices? Are any Mac devices also having this issue?
2) How long has this been ongoing for?
3) Are you able to log in to your My Virgin Media account without issue?
4) Do you also get any error code along with the message?
5) Is this happening whilst trying to watch live TV, recordings or both?
Thank you for your patience whilst we look into this for you.
All the best.
Molly