I've had my samsung galaxy ace 2x for about a year now. Recently, it has stopped connecting to my home wifi. It'll say that it's connected but I can't use applications that require wifi. It will work for some parts of the day and I will be able to use wifi but then it will stop working. I've done a router reset, a factory reset on my phone, taking out the battery, forgetting the network, but sometimes when I enter the password to my wifi, it will say error authenticating. How do I fix this?