keyball_set_cpi() crashes the keyball

[Ceffa93]

I have the following code:

layer_state_t layer_state_set_user(layer_state_t state) {
    keyball_set_cpi(get_highest_layer(state) == 3 ? 1 : 4);
    return state;
}

After some time I use the keyboard, the pointer completely freezes.
Re-flashing does not solve the problem, the only way is to reset the controller manually.
It is easier to trigger the problem by switching layers frequently.

I tried many variation of the code:

• reduce frequency of updates
• move code to other functions that trigger at different timings

but I have not yet found a way to solve the problem.

This makes keyball virtually useless for my case, as I wish to control the speed.

[TeoChi-CF]

Maybe this is related, I had the same issues, the way to make it crash 100% was to rapidly tab between Kb 2 and Kb 3, the entire half of the keyboard having the keyball stopped working. The cable was plugged into the half that didn't have the trackball.
Connecting it to the half that has the trackball seems to solved the issue, although I like it plugged in the other half as that makes the desktop cleaner.