It's not the Pro Q..... I guarantee that.
How hot is your fuel source, how much fuel are you using, what kind of fuel are you using, are you using any liquid in the water pan (if you are, don't), how many stackers are you using, what are your lower and upper vent settings set at, what is the grate level temp? Answers to these questions will help figure out your issues.
Stackers, liquid in water pan and/or fuel load will be where you should find the issue.
We love our UDS's...but dial in a Pro Q and you can make magic.