IPhone 5c won't stay connected to Wi-Fi network?

IPhone 5c won't stay connected to Wi-Fi network. I just had the screen completely replaced and it has no service at the moment. While I wait to get service I was going to get a feel for it using Wi-Fi, as far as apps and internet. It started off fine, I downloaded like apps and after about minutes the Wi-Fi disconnected. I tried everything that I found online on forums on youtube everywhere. Tried resetting the network settings, the location option in privacy, and just abour everything else, turning airplane mode on and off, nothing seems to make it work. On the Wi-Fi setting I see my router pop up but after seconds it goes away, they iPhone scans and it reconnects and it does that non stop. Currently running on iOS 8.3. Any ideas what's going on? Btw my Wi-Fi works with just about everything else I have in the house…

Are you sure that Wi-Fi connection is stable with other devices.

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