You’ll be able to go into the settings (use the digital pad) and replace the firmware of your management pad. Additionally flip the management pad off, take away the batteries, let it drain for a bit, put the batteries again in and resynchronise.
This occurs sometimes. After I purchased two consecutive substitute sport pads solely to search out that this defective behaviour stopped occurring as quickly as I might purchased them, I began questioning if one thing else was up. I assumed that possibly Microsoft had give you the final word grift (lol, joke)!
However regardless of regular points of wear and tear and tear that may result in these sorts of issues, I feel there is a subject the place the controller turns into uncalibrated and subsequently unresponsive. I’ve largely discovered it on up and down on the left analogue stick, much like you.
Every time it is occurred, I’ve given the controller clear (you will discover guides), turned it on and off once more as described above, and checked if there’s new firmware.