Nexus 7 3G problem with GSM signal strenght when it is hold horizontally

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http://forum.xda-developers.com – My nexus 7 3G (CBOK) is showing signal strenght of gsm about -95dBm/9asu when it's holding vertically and -111dBm/6asu horizontally (hold with both hands - especially when I hold him on the side of the camera, probablly the place of the GSM antena. Therefore, the use of the Internet in the horizontal position is almost impossible, vertically everything is ok. Someone noticed the same behavior? signal strenght of gsm is showing in Settings -> About tablet -> Status / Signal strength. (HowTos)