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Hello, We understand how frustrating it is to lose your data connection.
Here are some tips that may help: https://www.samsung.com/uk/support/mobile-devices/how-to-troubleshoot-mobile-data-issues/
If you continue to lose the data connection, you will need to reach out to your service provider for additional assistance.
In the event, the service provider is unable to resolve the network concerns, it is recommended to have the phone evaluated by an authorized service center. You can use the following link to find a list of service centers in the U.S. that can do the repair: http://www.samsung.com/us/support/service/location or by contacting customer support at 1-800-726-7864.
For assistance outside the U.S., please use this link: https://www.samsung.com/us/common/visitlocationsite.html