I came here for the same question. I found a treager recipe, from the comments it says it looks like it will take about 2.5 hours total. I'll link the page below. Good luck, hope it turns out great.
tenderloin recipe
I have never thought to unplug my stampede. I also thought it might mess with the wifi. Haven't had any issues but will probably start unplugging after reading this. Thanks for the info.
I like @charlesrshell idea. I would think it has something to do with the pellets. I didn't know they make heating pellets either. Maybe just a bad batch.
I just got the 590 last weekend. Was deciding between the 590 and 700, I will probably regret going with the smaller one eventually. Saying that the 590 is the perfect size, not too small or big.