Default [Q] Home button wake but don't go home screen

Hi all

This is so weird, but today 'my' X10 (which is currently with my brother, because I bought a Moto G) gave a different error: the home button wakes the device but do not go home much less holding Recents apps appear!

any ideas? buttonremaper tried but have always restarts = /
what should I do?

thanks for any help!!!