Reset the TC.
Give the wireless a proper SMB compatible name.. ie short, no spaces, pure alphanumeric
Use wpa2 personal security with password of 8-12 characters.. pure alphanumeric.
Fix the wireless channels for 2.4ghz in particular. Pick 6, 11 and then 1.. try in that order.. most people find 1 doesn't work so well.. perhaps shared by bluetooth.