I would recommend that you go into the mobile app settings ( Menu > Settings Cog) and then ‘Get your location from this phone.’ Even if everything looks OK I would recommend disabling and reenabling the location access for each Location shown. The app has got pretty good at detecting if it has the required location access and exemption from being put to sleep.
Unfortunately you may need to recreate or edit any automations based on the presence sensor as it is likely to change its ID as a result of the above.
I have to do this just about every time the SmartThings app updates on one phone.