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how do i fix my performance 620W rotary hammer drill ?

Rotary hammer drill FMTC620RHK model
If i hold the drill level - it will run ok . if i then point the tip downwards as though to start doing some breaking or drilling it stops running. I have had a qualified electrician open the handle and there are no loose connections to the switch. where do i get him to look at next - any ideas.
Chris Galloway, March 2012