We've experienced huge noise in all 11b channels seriously damaging services in Emerald and Crystal rooms right before the afternoon refreshments break. We have no good clue on what might have made such noises, but noise has almost disappeared in the rooms around the break time when people moved out of rooms. It could have been a malfunctioning client or even a jamming device? Hence, we'd like to ask all of you to check if your wireless card is working properly and if possible reset your wireless adaptors. Regards, Woohyong Choi / IETF59 NOC Team