I updated to ros 3.2 on RB333 and when dfs=radar detect it locks the machine. When pinging I had 30% successful packages and 70% lost. Fortunately I could telnet into the box and disable the wlan. Rebooting did not help.
Routerboard 532, cm9.same issue and same solution.
CPU utilization was 100 % constantly, i had no time to check on which frequency it is running.supout sent to support