Yesterday I pulled all the various cuts of beef that I have for cutting into stew meat out of the freezer, and today I made a large pot of (the beginnings of) beef gulasch (I say beginnings of, because I left out the spices, so that they don't go weird in the canner) - basically browned beef cubes, lots of onions, some garlic, some tomato paste, paprika, and beef stock. I filled 3 quart jars, and the rest will be dinner. And then I put the jars in the canner. And now I have an observation, and a question.
The observation is that I need to remember to use the loo before canning meat - 1 1/2 hours is a
long time! And/or I should avoid drinking cups of tea while the processing is going on. That little jiggler and its little puffs of steam were sending urgent messages to my bladder, and I almost cut the whole thing short by 10 minutes, but didn't dare

.
And the question: I've found that once things are up to pressure I can turn my (glass top) stove down to almost bare minimum to keep things jiggling merrily along. But today (my first go at meat canning) after about 45 minutes the whole thing started to run amok; even at "LO" the pressure started to rise, and the jiggler went nuts. I had to turn the heat off altogether to bring it back down, only turning it back on as the jiggler slowed down. I did this once or twice (never letting it stop jiggling), and then everything was fine again; It maintained a nice even rocking motion, and the gauge was right where it should be. So, what happened? Was there perhaps some sort of blockage in the vent (from where?) that loosened on its own? And what are my options if this happens again, and doesn't resolve on its own? I suppose I could stand over it for 45 minutes turning the heat on and off; or turn the whole thing off, let it lose pressure, clean the vent, and start over. I have a feeling you experts are going to suggest the latter.
The pressure just now went down so that I could open the lid, and none of the jars broke - which was my first thought when the vent appeared to be clogged. And the vent is clear now, though I knew it would be once everything settled down. Any ideas to help this newbie?