Review on ASMOKE AS350 Portable Wood Pellet Grill & Smoker, Superheated Steam Technology, 8-In-1 Cooking Versatility, 256 Sq In Navy Blue by Daniel Mind

First use with ribs was excellent, though temp range was 30-40 degrees instead of 10. I am now doing chicken thighs and the temperature is out of control. Preheat at 225 and it goes to 300, then down to 166, then up to over 450. Opened the cover and it goes down to 174 ,then back up over 400 and i turned it off and set to 180. After it went back over 400, i try to control temp by turning the unit on and off. If this is not resolved, i need to return or replace it.