It appears that your iPhone 6 isn't staying connected to your home's Wi-Fi network while other devices have no issues. I'm happy to help.
If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network -- Even though other devices are staying connected to your Wi-Fi network, the steps in this article can help.
Potential sources of Wi-Fi and Bluetooth interference -- You may also be experiencing interference with your Wi-Fi signal. Follow the steps in this article.
Recommended settings for Wi-Fi routers and access points -- Please ensure that your router is set up using the recommended settings.