Bosch gop250ce

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Roofer / Carpenter
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I have a Bosch gop250 that I've had longer than 3 years, had extended warranty on it but very rarely used it... so in that time it would equate to a few weeks of normal use..
 I used it yesterday and all of a sudden most of the power has gone... it doesn't oscillate but motor still works, so it isn't the brushes...  any ideas would be appreciated.