very Low Signal form RB Metal 2SHPn

I am using RB Metal 2SHPn & RB Groove 2Hn for AP. But I am facing big problem from RB Metal 2SHPn. Where RB Groove 2Hn has signal fo 60dbi , In that place RB Metal 2SHPn has 35dbi to 40 dbi & the signal is always very up down. The configuration is same as RB Groove 2Hn. I had upgraded the RouterOS to v6.7 , The result is not good and signal is very Up Down. So please help me.

35dB to 40 dB is more signal than 60 dB

It likes that the signal is to heavy, reduce the signal

The signal can disturb itself

This signal in not -35dB . This is Signal to Noise 35.
signal.jpg

Have you a line of sight between ap and station?

Which antennas are you using on the groove

I am using 2.4 GHz 15 dBi Omnidirectional Antenna on both Grove & Metal 2SHPn

http://www.l-com.com/wireless-antenna-24-ghz-15-dbi-omnidirectional-antenna-n-female-connector
images.jpg