Aerosky H100 quad twitches

I have a Aerosky H100 that has developed a twitch during hovering. I have not changed or upgraded anything from factory. This unit has the MWC Flight Control Board without GPS. Flew great for years. I have swapped the stock controller and reciever with a DX-6 with no issues until lately. I have done research and only came up with maybe the PIDs may need tweaking. Would like some thoughts please.