It sounds like the main oven is set to "auto" time.
This means its either set to turn off at a certain time, or come on at a certain time.
This can easily happen if here has been a power cut or the oven has been switche off at the mains.
It is highly unlikely all three things have failed at once.
It is probably easier to read about this function and how o enable / disable it, in the handbook, rather than me try to explain it as it uses symbols, I cant replicate on a keyboard.
If you dont have the manual please let me know and Ill upload it for you.
If you need further help, please just ask me.
In the meantime,
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