Changed the computer from a wired to wireless connection for a few days. Now the network shares will not mount at boot. But they will mount with sudo mount -a. I tried adding _netdev but that made no difference. Relevant line in /etc/fstab: //192.168.1.9/video/shows /media/tv cifs credentials=/home/media/.smbcredentials,_netdev,iocharset=utf8,gid=1000,uid=1000,file_mode=0777,dir_mode=0777 0 0How do I get _netdev to work with a wireless connection? 
how do I get fileshares to mount after a wireless connection is established?
mount;fstab