Touchpad randomly disabled upon reboot on lenovo x1c7

Just switched from apple to lenovo (carbon 7th gen), installed Ubuntu (19.04, with 5.0.0-25-generic). However, the touchpad randomly is disabled upon reboot (it is activated in the system settings). After rebooting the touchpanel sometimes starts to work, sometimes doesn’t. This happens only with the ubuntu partition, not with Windows. Can somebody help?