If you experience missing incoming calls and text messages, or periodic text messages which do not appear to have been sent while you are on wifi, please check the following options and then exit Fongo and relaunch the app:
Account > Settings > Troubleshooting > Battery Optimization (click to disable, Android 6,7,8 only)
Account > Settings > Troubleshooting > Use Wifi Lock (click to enable)
For Android 6 users, we have found that disabling Doze altogether may help resolve this problem, there is an app in Google Play called Disable Doze which you can try: https://play.google.com/store/apps/details?id=de.geroo.disabledoze&hl=en