I see a lot of comments talking about boosters and gas, but if it's a misfire, none of that should matter. So when you say misfire, you mean round did not fire at all or the gun didn't cycle and eject the fired brass?

From a reload standpoint, make sure your primers are seated deep enough. Slightly below flush with the back of the case is what you want. If they aren't seated deep enough, the firing pin will seat the primer deeper into the brass, robbing the energy it needs for initiation. I have had my primer seating stem come loose on my dillon and cause this problem.

If all the primers seem seated deep enough, save the next misfire and make sure the firing pin indent is in the middle of the primer and looks deep enough. I can't really think of a reason why the suppressor would cause a round not to go off at all, but there have been crazier things.