I received several emails from UA that my HNL-SFO flight and the ORD-HNL were WIFI equipped and had the beta wireless entertainment system. United WIFI and Wireless entertainment systems are horrible on the B772-Hawaiian configuration. WIFI connection said unavailable. Wireless entertainment system kept freezing. The audio would freeze and the video would be running and vice-versa. Too many users and not enough bandwidth were causing the erratic problems. Flight attendants were unable to resolve the problems.