I had something vaguely similar when the transmission mounts gave up on my 924S, so it is worth checking them and the engine mount as suggested earlier. Otherwise I would tend towards a gearbox problem, have a look at the oil to see if there are metal particles.
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Grant
Arctic Silver 2000 Boxster S - bought with a broken engine, back on the road with the engine replaced
Green 2000 Boxster 5-speed and 1978 928 auto
1987 924S 5-speed (Sold) - Blue 2000 Boxster 5 spd (Sold)
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