Charging problem and noises with the UMC 240

I charge my Roadster with the UMC 240 and 16 A.

Today when I connected the car it did not change from white to blue light. Suddenly, after about 60 sec. it changed and started charging.
Then after one hour I went to the garage and the car made a noise. It was like loud noise coming from the rear fans. Never heard a noise like this on the car.
I stopped charging manually on the screen and the noise went slowly away.
When I attempted to start charging again with the UMC the light stayed white and the screen said: "Waiting...."
I connected and disconnected opened and closed shut down and on looked after the fuses. Butt it did not want to start charging again.
Then I took my mobile connector put it on 10 A, and now it charges immediately. Tha fans are working but not so loud.
What is the problem?
Two problems?
Or is the UMC broken and made the car behave strangely?

Thank you.
The fans never have been that loud like today!? But yes, they are louder on 16 A then on 10 A
The UMC has restarted working, but it is not immediately when I push the "close-glider" that the light changes from white to blue, it takes 60 seconds to minutes before it suddenly does and also the green power light on the charger goes on.

Not yet, its evening, and I do not want to spoil them the evening because of this. But will call them tomorrow, and in two days the car has its scheduled service, anyway.

It is louder then usual and it is not warmer then usual. The front fans do not come on. You can feel the car vibrating when you touch it, so I suppose at least one of the fans has a problem.

The charging with the UMC didn't start at once also when not having been interrupted.

I guess those are two separate issues. I'll talk with Tesla tomorrow.

Talked with Tesla.
They think there could be two problems.
The fan on the rear left side and the charger.
They will look at it tomorrow during the scheduled service

Once again, fantastic experience at the Tesla Store Zürich today!

I went there, because I had some business at the same street as the Tesla store, even though they had offered to make the service at my home. When I arrived they were allready waiting and started working immediately. I was sorry that I had something to do, and was not able to watch all the time.
- They changed both rear fans
- They made a firmware update which according to them gives the recuperation more power again
- They gave me a new entire soft top. One of the levers, was free, no spring action, so they changed the whole roof
- My UMC worked without any problem at their place. On my drive home I tested it on a recharging station and at home. And yes, it works, with no problems now. So they suspect a problem at the installation at my home...

What a fine experience!