MacBook goes to sleep at random intervals

Hi all, My wife's Mac keeps going to sleep at random intervals

its a MacBook5,1 Mac-F42D89C8

This can happen at any time including :

Regardless of being plugged into the charger or running on battery

If it's writing a CD it will sometimes enter sleep mode

When synchronising with an ipod - it will sometimes enter sleep mode

I've even gone as far as using a spare hard-drive, formatting it and installing EL Capitan on it - after the install had finally finished - I had hoped that the sleep issue would disappear...

Around 10 minutes later - it went into sleep mode again

the only way to wake it would be from pressing the power button and waiting for a response..

Thanks

Andy

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