Hi Everyone,
So some feedback. I managed to overcome this. My flow is in a solution so on the flow (in the solution) I clicked on the three dots>advanced>Add required objects.
When I went into the flow again the errors had cleared.
However, I did go out of the flow and in again a few times and each time it was happening with different connectors- Ones that were fine before were now exhibiting this error and ones that had the error were fine on subsequent tries and it keep changing as I exited the flow and edited again.
I didn't delete any actions or touch anything.
I only tried the 'add required objects' after this and it seems to have done the job.
A number of the connection references, etc seem to have vanished somehow so this action seems to have put back what went missing.
How it happened is anyones guess.
Maybe it's a service health issue.
Thanks everyone for your help and input.
Hope this helps.
Regards,
Daniel