I did a long cook overnight on mine and had several wild temperature swings depicted in the app. Multiple crashes this morning. Long delay in showing actual temp and probe temp. This was the worst cook I've had so far on my Bull. My assumption is the temperature swings were because I was running through some old Traeger pellets I had laying around. But, delay in temperature updates is very frustrating and kept me close to the smoker most of the morning to keep track. Defeats the purpose of having app on the phone.