I have an original (2017) Timberline so controller, and basically everything else, is different. No wifi antenna, no pellet sensor. 3 phone calls to Traeger last week because wifi won't hook up since new "app update". over an hour on hold each time. Bottom line, I figured it out myself--it's because the wifi reception by the grill is terrible! my router is only 30 feet from my grill, but my signal strength is still -65. I don't remember it being that bad before. Anyway after trying for hours to pair the grill, I decided to try to do it with my phone's Hot Spot. with phone sitting on the grill shelf 2 inches from the controller, the signal strength goes to -15, and everything pairs well. move 4 feet away, still outside, and drops to -45, go back in the house and it drops to -60 and grill goes offline again. Trager's response: try a wifi extender! I'll probably have to tape it to the bottom of the grill. Have one ordered, will let you know if it works.