Strange behavior was noticed with multicore hardware on platform x86. I tested ROS 5.6 and 5.7. In both cases my x86 router hangs up every 4-6 hours. There is no apparent reason why this is happens: no unusual amount of traffic (about 50 Mbps), no unusual cpu usage (about 50%). It was working about 3 months with multicore configuration and ROS 4.x without any troubles. Router with one core and ROS 5.x working just fine too.
My config consists of simple routing, nat and about 500 simple queues.
Has anybody the same problem?
Did you restore from a backup in each case. I have had some issues on some systems when restoring. have you tried a system reset-configuration to see if it resolves the problem. also instead of a full backup you can export segments such as /ip firewall export file=firewall from the terminal and then copy these files to your desktop then reset configuration and restore one by one and verify that all is good.