please contact support@mikrotik.com with the support output files attached. Maybe in your area some other equipment is using 900mhz for data-communications. Maybe some utility meters are suing 900mhz to transmit data to the main central? Try to change to a different available frequency. supout sent...

Power levels were checked at Radio, and down the cable at Antenna using @900mhz:
http://www.praxsym.com/t-meter.html

Fwd, reflected and VSWR were within expected readings.
VSWR 1.2:1

With the thought the radio could be at fault, the radio was replaced with another 9HPn with same symptoms.

Actual noise readings: 20mhz channel ~ -113dBm noise 10mhz channel ~ -116dBm noise 5mhz channel ~ -119dBm noise On all channel widths noted, noise is observed at exactly -97 with no variation, for 1 to 2 minutes; connection is dropped during this noise event. -Is this noise from environment? i.e., c...

in which country are you using it? Maybe you have a strong interference in 900mhz? Band shows as 2.4ghz because it is down-converting 2.4ghz band to 900mhz. But the frequencies values should show you 900mhz frequencies. -US -Could interference result in the noise reading of precisely -97 dBm? When ...

metal 9hpn drops registration for 1-2 minutes when noise goes from ~-113 to -97. Peculiar to note that it's -97 every time; no more or less. Occurs as often as every 5 minutes. sometimes not for +10 minutes. Normal signal is ~-77. chnl width 20mhz. Bridge.9hpn))) nv2 (((9hpn.sta bridge Ptp only And....