My HA works off a Raspberry PiB for 2-3 months at a time.
I have gone from micro SD to a external usb memory stick but the same thing happens.
The HA OS becomes inaccessable from the App, I then have to pull the power to reboot it and it never comes back online.
I start the complete install from scratch and restore from last backup to retain my automations and settings.
Whether I run updates / none the OS becomes unstable. How does one remedy this?