This plagued me with a much older MBP (2010) for a long time before I stumbled on the solution by opening it up. It even preempts UI, which makes it especially

This plagued me with a much older MBP (2010) for a long time before I stumbled on the solution by opening it up. It even preempts UI, which makes it especially maddening, as things start hitching. Turns out there was a solid mat of dust between the fans and the heat sinks. So it’s not always from charging on the left side.