hi all i recently brought an used supposedly 200hrs m140m 50nm from ebay,seller recomended 1400ma max current,any way i ran it at 1200ma and after about 20mins it died,it was on a laser engraver with a fan cooled diode holder,was running cool,my driver has a ramp up but no ramp down on turn on and off,the ebay seller is saying thats what killed my diode,does this sound a valid reason?,ive a feeling im being fobbed off,cheers m3vuv.