After reboot pi camera only works after restarting HA

pi1 b+
HA 0.85.1

After successfully setting up a pi cam on HA, I decided I would rather have the file write going to a usb stick.
I got it all working and modified /etc/fstab to auto mount the usb memory stick.

It works but if I reboot, the camera only starts working after restarting HA

I suspect on boot, the mount is only happening after HA has started, hence the need for HA restart.

However I don’t know what to do about it

It turns out the camera problem is spurious, and not related to a reboot.

I am seeing some pi low voltage warnings, so I suspect that may be the cause for the camera sometimes not working.