My dear reset network setting of both Sim one by one and also reset all setting of your's device in general management setting before this remove both Sim from Sim slots and without any Sim in slots restart your's device one time, flight ✈️ mode turn on and off one time, also clear catche of phone app. Thanks.
In case the issue still occurs kindly visit the service center for a physical inspection of your device. You can locate your nearest service center with this given link: https://www.samsung.com/in/support/service-center/
