How old is the plastic that the people are having issues with??
Did you buy it after the merger?
I have CCM plastic from both before and after the merger ...and I don't seem to be having the same issues, but I microwave mine in small/medium size batches and use a good digital thermometer

to make sure I control the temperature.
Are you mixing the plastic? There is no doubt that plastic that has settled could cause some of the issues that have been discussed.
The other obvious question is are you confident that you are getting the plastic to 350 degrees...or more? Otherwise ...it will get cloudy....and sticky.
Are you adding "non tested" additives...such as a home made scent brew? Adding a mystery chemical is bound to cause some issues!
It doesn't really surprise me that any plastic could start to burn if you have it on a stove/pot that doesn't have really good heat controls...or unless you are moving plastic through it fairly quickly. You are bound to start using up the heat stabilizer and those Presto pots are not exactly the bastion of Made in China quality!
I use a microwave and I always start adding heat stabilizer after the 2nd reheat. When I use my cast iron pots on a burner I always add a good shot of heat stabilizer as it sits.
And my 2 cents on this whole issue on if it should be even posted is....if you have a customer service issue...
call customer service! I don't think this public forum on "how to" is the place to manage a customer service issue (if there is one).