How to fix the Jerky and jumpy Apple Magic Trackpad behavior?
Solution 1:
Apple magic trackpad 2 owner here and every few weeks mine does this on bluetooth (but it's fine while plugged in and charging. The solution is to reboot your trackpad (just turn it off and on again using the switch on the back).
I think it's stupid that I have to reboot my trackpad but here we are. Also if anyone is curious why I'm responding in this question, it's because this is the top google result for 'Apple magic trackpad 2 jumpy".
Solution 2:
For me, turning Bluetooth off then back on did the trick for a very jerky cursor. Turning the trackpad off and on did not fix it.