I would suggest a full uninstall and reinstall, again. Mine actually took 4 different cycles before it settled in, and has been 95% solid since. If you have a fast internet, it shouldn't take much longer than grabbing a drink from the kitchen. Emphasis on "much".I have the same problem, the sim is not loading at all, stuck at 0% or reporting an internet connection error.
I reinstalled from scratch and it worked one time, after that it stucked again.
Extremely frustating!!!