Using my 2 + year old Smoke last night on the rotisserie, I found my remote unit would not receive a signal from the main Smoke thermometer. The Smoke worked fine, I just had to run out occasionally to check the temp. Today I checked the Smoke owners manual and tried to sync both units again with no luck. Neither unit had the low battery indicator showing so I called Thermoworks where I was transferred to their technical support division. The tech advised me to remove the batteries from both units and let them sit for 5 minutes. After the five minutes he said to put in a new set of batteries and try to sync the units again. Just like that I was back in business with both units communication again.
Just wanted to pass this information on in case anyone else with a Smoke unit encounters the same problem. If you don't have a Smoke or a Thermapen, I recommend you add them to your list of items to buy. They are both fantastic products and have really elevated my culinary skills.