Big country

I just bought a 2019 1000 sector had it one day the exhaust got so hot and red I thought it was going to melt down took it back to the dealer they put 2 new o2 sensors in ( less than 100 km) took a week to get the parts week later I take it out going down trail in high range the rearend or transmission starts banging and slipping total mileage on bike is 286km bike is back in shop waiting on approval from hisun to tare it apart so is this normal on these 1000 sectors