Battery Saving and Optimization Settings:

Open device Settings app

Tap on 'Battery and device care'

Turn off the 'Optimize Now' setting

Return to the previous screen (Battery and device care) and tap on 'Battery'

Toggle OFF 'Power saving' and tap on 'Background usage limits'

Toggle OFF 'Put unused apps to sleep'

Tap on the 'Deep sleeping apps' and 'sleeping apps' and make sure Medisafe is not listed here

Tap on 'Never Sleeping Apps' and add Medisafe here if possible (may not be available on all devices)