Help Please!! HOX AT&T version WIFI and data issue

[Ssnycshoot]

Hi guys,

I am using my HOX on straight talk-AT&T. lately I got a lot of proxy error and wifi just refuse to connect to any wifi network, basically I can't use the internet when I need to use it. I bought it used, so I guess sending it in repair is not an option for me. Is there anyway to fix those 2 issues? Thank You