Hello,
I’m experiencing an unusual issue with my RB450G router. Every time it reboots, the configuration resets to the default settings. I’ve tried using Netinstall with various versions—starting with the factory version 6.29.1, then 6.47.9, 6.49.13, and even the latest 7.x stable release—but nothing seems to resolve the problem. 
After netinstalling … what did you do with configuration? Did you configure it from scratch? Or did you restore config from backup file?
I configured from scratch, and yeah got deleted again when I just simply rebooted.
I configured from scratch, and yeah got deleted again when I just simply rebooted.
This seems to me like a problem for support ticket. Contact MT support (you can use support@mikrotik.com) and attach supout.rif files … one before reboot and one after reboot (which wipes all the config). They might be able to analyze what’s happening.