Miele Hygiene Info banner notice?

We have had this model for just under 2 months. All washes have been carried out using the Miele TDos detergent system at 40C. A couple of weeks ago, the Hygiene Info banner came on. We then carried out a Maintenance Wash but the banner did not go away even though the machine had probably accumulated less than 20 washes in total since new.

We tried to get help/advice from MieleCare. This ranged from 'I am not familiar with this model', to 'we do not have access to technical support,' to 'run it empty on the cottons programme at 90C'.

The banner has now disappeared after I disconnected the machine from the mains for 30 minutes.

I have posed a few questions that MieleCare seem unable to answer:

1. the manual states that the Hygiene Info message should come on at the end of a cycle AND at the beginning of the next cycle. We have never seen the banner at the beginning of a cycle (including just before the maintenance wash)

2. if the machine is left running, the display goes dark. What is the recommended way of bringing the display back on? Pressing the Stop/Start switch just brings on FINISHED. If there is a banner such as Hygiene Info would this appear if the Stop/Start switch is pressed? I ask because Miele has implied that the banner problem that we have had might be because it was not 'Confirmed' properly.

3. where has this recommendation for a 90C/3hour wash come from when the machine has a dedicated Maintenance Wash cycle?

I would be grateful for any advice. It's a great machine but ........