There’s a few things to try here:
One, try tracking with GPU tracking turned off.
Then make sure your hands and any other occlusions in the shot are rotoscoped and put in the layers above the track to holdout the data from the track below.
Next, track with perspective, because the object is moving in perspective.
If that continues to cause problems try increasing your search area by turning off auto and doubling the numbers you have, or increasing the search area until you get better results. See if that works for you.
If you’ve done any retiming, make sure you are tracking on the original and not on retimed footage.
This isn’t a bug, this is just that it can’t find the next pixel pattern to track. So you need to give it the right parameters to look for and even so, if the movement is too quick, you may have to use manual track to hand animate the worst frames and continue tracking as normal where the phone moves at a slower speed.