Dear guys....

Idk why but some time i have a big drop (only in RX antenna) of CCQ% value.... what can be caused? When i experience these drops i see a trop of RX speed on RX antenna.
 

My wifi is kind in between 2 building around 100m of distance but in a kind crowded area (city) there's not other building or any other permanent object between them, may u help me?

P.S. there's a way to really see logs? when i try i ever see only start up time line, that's it.... thx so much in advance!