RE horizontal - there is a ribbon cable that can literally fracture which causes the Zr and Zl buttons to quit working which only really manifests when trying to use 1 joycon horizontally (personally when Mario party happens).
The repair takes about 20 minutes the first time you do it and the ribbon cable is on amazon for about $7.
The repair takes about 20 minutes the first time you do it and the ribbon cable is on amazon for about $7.