Yes, it’s been happening to me. I do have SorrowCon drift, though.
Unfortunately, if you've tried re-calibrating your controllers/updated your controllers/done basic troubleshooting without it helping, this is most likely is Joy-Con drift.
This is exactly what happened to me. Drift doesn't just start with your character slowly walking away with no input; it progresses to that point. Originally, I occasionally had small stutters while walking like you're describing; it would happen only a few times a day. Then it would happen more frequently. I checked the joystick calibration, and it seemed normal there. Then instead of going from a run to a walk, it would go from a run to a complete stop. Then I finally started slowly walking even though I wasn't touching the joystick. Later, I would stand still even though I was holding down the joystick in a direction because it was drifting in the opposite direction. And it finally ended with me being able to run in a direction without touching the joystick just by holding down B. By this point, if I looked in the calibration settings, I could constantly see phantom inputs on that screen; the joystick just couldn't stay at its origin at all. I first started noticing drift with only around 100-120 hours put into my Joy-Cons. By 160 hours, it was difficult to deal with, and by 200 hours, it was unplayable.
There's a good chance that it will just get worse from here on out. If it does, your options are to either send it to Nintendo or learn how to replace it yourself.
Thank you both! Looks like I'll be cleaning, calibrating, and overall keeping an eye on my switch! Might be time to invest in a pro controller, haha