Recorded complaints against Hampshire Police have risen by 26% according to new figures.
The Independent Police Complaints Commission says it received 819 comments against the force, but says officers are dealing with incidents faster than the national average.
Kent, Sussex and Thames Valley all saw a fall in the number they received.
The Independent Police Complaints Commission (IPCC) is investigating the circumstances surrounding the death of a 19-year-old man in Chandlers Ford.
It follows an incident when ambulance crews asked Hampshire police officers to attend an address in Heathfield Road at its junction with Nichol Road.
They were assisted with a young man who was behaving violently and had become unwell.
The man was taken by ambulance to the Royal Hampshire County Hospital in Winchester where he died later the same day.
Investigators are appealing for witnesses in Chandlers Ford, between 6.30am and 7.30am on June 27, to come forward.
The investigation is looking at the circumstances surrounding police involvement with the deceased, including restraint techniques used, from the point officers arrived at the address.
The Independent Police Complaints Commission is investigating the conduct of the Deputy Chief Constable of Surrey Police - in relation to his alleged knowledge that Milly Dowler’s mobile phone was illegally accessed by the News of the World in 2002.
Surrey Police Authority says it voluntarily referred the conduct of Dep Ch Const Craig Denholm, last Thursday.
Mr Denholm was the senior investigating officer for part of Operation Ruby, the investigation into the abduction and murder of Milly Dowler in 2002.
The IPCC investigation is considering whether he was aware that the newspaper had accessed Milly Dowler’s voicemail in 2002, and his handling of that information.