RB411A

I have installed 2 Rb411A p2p and am having a superb latencies of >1ms. However am having
packet loss when the traffic is pumped. Surprisingly, i have various set up on mikrotik and work
perfectly even with the signal of -77dbm. In this case, am having a signal of -58dbm.
Can anyone explain what is wrong. Nstream on both mikrotiks are enabled.