Hello and welcome aboard.
I saw your post inside the "introduction forum," but I thought that since this is the correct forum for your device, this would be the appropriate place to try and help you.
I have had this problem before on my EVO 3D from Sprint - but i noticed that your device is on a different carrier (MetroPCS), so I'm wondering if what i am going to suggest will work with your phone.
The problem is not the router, It's the phone. On my device, from the dialer, I press ##72786#, then type in the phone six digit password...and disconnect and reconnect my service with my device carrier, but since this step won't work with your phone, you will need to "reset" the device to most likely fix this problem.
If you decide on doing this, please keep in mind that doing so..will erased all data from the phone. Also, let us know if this works for you.