This seems to be a common problem across many different laptops. My Lenovo laptop gets limited to Package C2 whenever I resume from sleep. Not good for battery run time when this happens.
It might be the NVME driver that is causing your problem. In my case, it happened after switching to Windows 10. I spent way too much time trying to troubleshoot this problem. If you ever get to the bottom of this, remember to post your answer here.