I don't have one of these smokers, but I understand your frustration of trying to connect a device to your phone. If you connected the first time, then there may be a glitch somewhere. Does the smoker manual have any information to reset the smoker back to factory settings? Have you tried unplugging the smoker for a few minutes, then plugging it back in.
As far as it was crashing, I had that problem with one of my devices, and had to set my phone not to go into "sleep" mode. Each time it did that it would disconnect from the device.