Thanks everyone for your help. I took the machine back to the service centre. They said that they adjusted the pressure. It is working just fine now, and I am happy that there was no extra charge.
It would be nice to know why it happened in the first place, whether it was something that they did during the initial service, or whether this is something that just happens after a bit of use?

Its got me beaten!

because there is no substitute for actually seeing what is happening rather than guessing from the safety of a keyboard.
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