I believe I have identified what is causing this ''''........too many login attemps" problem.
Some time ago I installed Loxberry on a RPi which requires access to the MS and my login details. Not so long ago I changed my MS password, completely forgetting about the Loxberry.
It would appear that Loxberry has been attempting to access the MS with an incorrect password, therefore creating the too many failed login attempts.
Moral of the story: When changing a password, don't forget to update the peripherals!