I have the same issue with my KS800 series as well. It works perfectly right off the box. After the first firmware upgrade it causes the "invalid ip addresss, cant connect to internet" after sitting on the phone with Tech Support didnt work out. They sent a technician out to replace wifi network module (v1165). Few days earlier, my TV got a new version update v1168.3. The wifi stop working again, same issue. Time to call the techinician out again.
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