Electronic Payment Account Issue

Hi everyone, I had an issue today when trying to creating an electronic payment bank file for our payroll.  We have always used one particular account for the preparation of these files and yet today I found it wouldn't allow me to use it.  I received an error message telling me the account couldn't be used and to check the linked accounts in payroll.  The account we have always used was still linked, nothing had changed, the account details were still the same as always and yet it no longer appears in the drop down menu when trying to create this file.  I had to select another account.

I have absolutely no idea why this has changed, I have done nothing at my end.

Can anyone shed any light on this?