I do think the controller and the probe attached to it to drive the auger could be better especially the length of the probe.  But, you get what you pay for and figure out how to make it work.

Best I can figure so far is what was mentioned by another member. Not having water in the pan. I feel like that was an after cause of the flare up but I have no idea.

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I had plenty of water in the pan both times.  The first time it happened it was boiling the water and I added some to it.  I even raised up the water pan the second time and it still did the flare up.

There's no P-setting?  Sounds like the classic flameout  ( or almost flameout).   I'm not sure why it would be more prevalent at 225F than when set lower though.

But what is causing the flameout?  I tend to think it is due to not getting enough oxygen.    I could not get my smoke tube to work which I believe it did not have enough intake air for it to burn.

Also both of my flare ups happened about 3 hours into the smoke.  I was thinking that maybe the control board was getting hot about that time.  When I put mine back together from unplugging the auger I put some foil backed tape on the heat deflector and above the control board.

I have had similar temperature spikes. I emailed Pit Boss and the reply message given me was to do this at startup: (1) With the door open, start the unit at 200, (2) Once the pellets catch fire, close the door, (3) Let the fire burn for another 5 minutes before setting the desired cooking temperature. This seemed to work on my next two long smokes--ribs and pork butt.
Another thing I found online was some people suspect another issue is in the water/drip pan. Many believe this prevents sufficient air circulation in the cabinet. So. I stopped using it and have replaced it with a large aluminum pan filled halfway with water. About every 3-4 hours I refill it with fresh water. I may in the future experiment with the original PB water pan by keeping it empty and place the aluminum pan with water directly on top.
I hope this helps.