Here are some steps to troubleshoot why your phone’s screen is automatically waking up or unlocking:

1. Check your settings and look for anything related to phone screen wakeup settings, e.g. 'Raise to Wake'.
2. Perform a restart of your phone, as this can help reset any changes you may have inadvertently made.
3. Check your phone for any malfunctioning apps, as they could be causing the problem.
4. Check to see if your phone has any physical damage, or is coming into contact with a magnet.
5. If the problem continues, contact your phone’s manufacturer.