You don't give any system information, so I'm guessing here. There's an old post here from a couple of years ago that found MSI Center to be the problem.
https://community.amd.com/t5/processors/power-settings-keep-resetting/td-p/347456
But, if you don't have something like that installed, I believe that with the newer processors, AMD got rid of the AMD specific power plans. I'm wondering if the new chipset drivers disabled those plans because of that.