I can reproduce the steps to make the top buttons stop working and sent those steps to support a while back.
I am not sure what the steps are to make the
sketch button stop working. Usually, when it happens I am doing a lot of moves and rotates and switching between sketches. I feel like there is some combination of having selections and touching the background to “unselect all” and getting into this state. I’ve not tried to find a set of reproducible steps but I will give it a try and let you know if I figure them out.
I would estimate that if I use the app for 1.5 hours it will happen at least once.