i am having a issue with router CPU usage peaking to 100% randomly, i have attached a log screenshot which i noticed. looking for some advice as i am very new to this technology. 
It could be a faulty cable, or a mismatch between data rates.
Check this: http://forum.mikrotik.com/t/log-excessive-or-late-collision-link-duplex-mismatch/74307/1
If that doesn’t help post your Tools → Profile
And take a look at interface statistics to see if you are maybe having a broadcast storm (A lot of packets).
i noticed that the management shows a high usage when the router CPU gets peaked to a 100%
here is a screen shot of the profile when the CPU peaks to 100%
http://wiki.mikrotik.com/wiki/Manual:Tools/Profiler
Is it spitting a lot of log entries when the cpu is at 100% ?
Not really sure what the management process falls under.
Try setting data rates on both ends to the same value (eg. 100 or 1gbit) and see if it helps (disable auto negotiation)
Hello, did you find a solution for your problem?