The AS 350 has a documented history of loss of control events.
I've attached an interesting TSB (Canada) report, as well as the appendix to the report which lists 25 loss of control events.
Aviation Investigation Report
Hydraulic Flight Control Malfunction
Vancouver Island Helicopters
Eurocopter AS 350 B2 (Helicopter) C-GNMJ
Kamarang, Guyana
06 February 2005
Transportation Safety Board of Canada - AVIATION REPORTS - 2005 - A05F0025
Loss of Control Occurences:
Transportation Safety Board of Canada - AVIATION REPORTS - 2005 - A05F0025