Dear Samsung member,
Greetings from Samsung customer support.
Please visit this mentioned link to resolve your device issue: https://www.samsung.com/in/support/mobile-devices/samsung-galaxy-smartphone-how-to-optimise-network-...
In case the issue still occurs. Please register your concern in Samsung Members Application (Open Samsung Members Application > Support> Tap on error report > Type your query > Send).
Thank you for writing to Samsung.
Samsung Customer Support