To help you identify why this is happening, let's begin by checking your network services to ensure there's no issue on their end or with your services, @Starbella. After you've done this, if there's no issue with your network services, switch off the Galaxy A53 for 20 seconds to give it a fresh start. While it's switched off, as process of elimination, try using a different SIM card to see if this still happens. If you still experience this, try resetting your network settings by going into Settings > General management > Reset > Reset network settings.
