I have 2 phones a Samsung Galaxy Grand Prime (have had over a year) and an LG G4 (just a few weeks old), they would both connect to my home wifi until 2 days ago and now neither of them will, they can't even find the network, just keep searching. They connect to other networks just fine. It is not my router or anything as all other devices and tablets work as always. How do I fix this without a factory reset? I think I have tried everything.