Yep, it's pretty much an epidemic at this point.
All you can do are the basics. Fill the carto and let it soak 10-15 minutes. Start at a low voltage with short burn times gradually working the wattage up to reasonable levels. In my experience if you start with one tasting burnt its one of the "bad" ones and you might as well toss it. If you've been using it for some period of time and it just now tastes burnt its also done. Some people believe shorter carto life is also part of the Boge issue, though I haven't experienced that so far. The ones I have that are good from the start are easily lasting 2-3 weeks. I'd also double check your wattage and make sure you are well within proper specs for optimum carto life and taste/hit.