I’m having the same issue. What I have found so far is the battery charges (new battery). When I have the pc plugged in does the same shutdown. When I run it only on the battery everything is normal again. tried my other HP power supply and same issue. When I boot into the BIOS and run the diagnostics on the laptop all is good and wont shutdown at all while plugged in. SO… I conclude it’s a windows feature. not sure what it is yet.