I don't have a shot or the ability to get one on one of my clients getting the red x's.
I would expect the I: drive to give this problem because it is mapped to an ip address (
I assume .27 is your router?)... you could build/ run a DLNA server to help out but I expect the issue will remain otherwise... another cheap (
untested) option, could help if you slow down the boot time on the client machines by say 30 seconds to give your dns a helping hand.
p.s. newer systems tend to remember network settings and that prob helps your W8 and 10 stay logged in were as the older systems drop.