You can try resetting the router. The router sometimes have the capability of remembering network settings, and this could help with your network problems. After resetting the router, your network connection should be okay by now, but if it’s still not, then you might want to reset your iDevice.
Jan 10, 2017 How to Fix Network Connection Problems on iPad You can try resetting the router. The router sometimes have the capability of remembering network settings, and this could help with your network problems. After resetting the router, your network connection should be okay by now, but if it’s still not, then you might want to reset your iDevice. Resetting your network adapter in Windows 8 Sep 16, 2012
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How to Reset a Mac's Network Settings… - Apple Community Nov 27, 2017 Canon Knowledge Base - Reset the Network Settings to