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Tax Account Authorisation?

I’ve been using Quickfile since 01.04.19 and have successfully submitted 2 vat returns with no issie but now I cannot raise/submit a vat return :
Your Tax Account authorisation may have expired. Please try to remove the existing link and reconnect on the HMRC Connect page.

When i click on HMRC connect I get :{“error”:“server_error”,“error_description”:“unexpected error occurred”,“state”:“e84ab9e8-f4c8-4774-ba89-bcc93aa55b6d”}

Do i need to actually remove an existing link? How to?