Hi Chichester, that's puzzling, let me look into it for you and I'll come back and let you know how I get on!
Hi again, I'm afraid we haven't encountered anything like this before! The first thing we'd like to try, if it's ok with you, is resetting your password centrally. You'll receive (another) new password, which you'll have to reset once more (I hope you're not running out of password ideas!). We hope that this might somehow break the cycle you're in. Let me know if you're happy to try that!
Okey doke, you should receive a new password shortly - you'll need to change it to something more secure the first time you use it. Fingers crossed!