Hello,

Today when I logged in on my MIkrotik I've noticed that the CPU is running at 100%, using Profiles I saw that "flash" is using 95%.
What is flash and why did this happen ?



Thank you.

It is because router is running out of free memory. Try to reinstall router with Netinstall to solve this problem.
http://wiki.mikrotik.com/wiki/Netinstall