Guest Mode in 3.6.2 does not keep fan/rgb settings after reboot.
It used to work just fine until 3.5.9. Got broken in 3.6 and you promised to fix it in 3.6.2 but it only works when you sign in. In guest mode settings are not saved. I've tried on another PC and same problem.
This was fixed in 3.6.5, please update to that version.
Please see my post for a temporary work around