router with hotspot get CPU-100% ,why?

RouterOS General
1

hello,
I have a RB with hotspot+proxy on it that serves about 10 devices
sometime the CPU get to 90-100% for a long time (1-3 min)
what can cause the problem? how can I know where the problem from?

Thanks ,

2

check
/tool profile

http://wiki.mikrotik.com/wiki/Manual:Tools/Profiler

3

Thanks ,