Temp failed

[dkuchenberg]

I am new to pellet smokers. Last weekend I bought a Pro 575. Today I attempted to season my smoker. I followed the instructions to the letter. I ran the auger until I heard the pellets fall into the fire pot. I set the temp to 350 and pressed the ignite button. I watched as the temp came up to 350, I then set a 20 min timer and just watched my phone. The temp went up to 385 and then started to fall. I watched as it came back down to 350 and then watched as it continued to fail. It kept falling until the 20 min timer went off. The temp at that time was 190. I shut down the grill. I'm not sure what to do at this point, I guess I will let it cool and try it again. Any thoughts as to why the seasoning failed would be greatly appreciated.