Losing connection to network after 5 seconds

smp67

    I have a Galaxy Note 5.  When I turn on the phone, it finds the T-mobile network and I get bars but then within 5 to 10 seconds, it then loses the network and goes "searching."  It never finds the network again.   I switched out the SIM card with a family member's but had the same issue.

     

    Any help would be appreciated.  Thanks!

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