Vailliant ecotec pro 28.Help would be much appreciated.

Hi folks,
I've just noticed that my boiler is switching itself off.
It's not on timer mode.I turned the boiler on around 30-40 minutes ago and the radiators started heating up.Around 20 minutes later I felt cold and checked the radiators and there was no heat even though the boiler was still switched on and the thermostat set to 21 degrees?
I switched the thermostat off ten back on and it has started heating up again?
Are they designed to switch off when they heat up?The room wasn't even that warm?
Any help is much appreciated.Thanks.
 
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