Hello
I have realllyy big problem, I’m using mikrotik few years - and this is the first time I face such problem:
Once per every 2-3 days Mikrotik Hung’s up !!! I don’t understand why, I have external log ( syslog ) and there is no problem, no DDOS, no high utilization in “profile” ( there was such problem because I’ve previously migrated to 6.x and then came back to 5.26, but I turned off temporary “security” package - and problem disappear ). But it still hungs up 
. After restart it works normally.