It's tough to say. V59 didn't solve my problem of the screen going blank daily. It was the head unit (screen/top visible part) that had to be replaced and that solved the issue for me. If it's just a reboot and it comes back after a while, it might be worth it to upgrade, but I'm pretty sure that some people have experienced reboots with v59. I haven't experienced any reboots even with v58.
V59 makes things slower in my opinion so if you can live with a couple random reboots here and there, then I wouldn't.
I had to go to the dealer to upgrade .. they might have a more recent v59 version than what I have.
Thanks SDL, really appreciate that. The dealer is like an hour away from my place. I called and they don't seem to have a clue about it. I'll upgrade it for now and see how it goes, I don't know if the package on the mazda web have the OS version, it says it's an map upgrade.