galaxy J7 prime problem in wifi always become auto disconnect, even have wifi signal

recently i had bought samsung galaxy J7 Prime, which is the latest brand of samsung, i am facing a problem in wifi connection, i think its wifi signal capturing power is so weak, mostly its become auto disconnect, even i have the wifi signal, i am very worried about this, because i had spend one of my salary on this to buy,
kindly help me about this to solve out.

Thanks....

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