My Performer 405 loses suction for about 30 minutes and then it slowly comes back. It has happened now about 3 times, but only on larger jobs of 4-5 rooms or more. It will be going fine, and then over the span of about 1 minute, the suction goes from full to almost nothing. I empty the tank, check the seals, clean the inline filter, and no change. Each time, I've had to wait about 30 minutes for it, and then it will gradually increase back to full over then spam of about 2-3 minutes. Any ideas as to whats going on?