I bought a new flame boss 300 yesterday to smoke a pork shoulder with. I'm about 5 hours in now everything was rolling along nicely, but all of a sudden the FB meat temp started dropping. I've got another meverick thermometer in it also. They were both up to about 152* by hour 4 now the new fb has dropped to 124* and holding. The other is reading 170 and I stuck another thermo in to confirm it. Any ideas what's going on with the FB? Did I get a bad probe?