hey Spotter18 if you install the latest firmware it resets everything automatically so try that.
in settings in piracy i think its in there, theres an option for factory reset also!
dont forget if its rooted you can backup all your settings and apps before you do it!
also before you do it make sure its not the wire itself try a different one if you havent already!
personally i only use the wifi never tried the lan cable, but when i use the hdmi cable it jams it too . sounds more like software issues to me.