Q: no matter what i try,  my apple tv says it cant connect to the network and it gives me error -3906.  i have tried restart and reset, wifi, ethernet same error. all other devices work fine.

My apple TV has been working fine. Now it gives me error -3906 and says it cant connect to the network. it wont accept the password for my wifi.  I have tried to restart and restore both the apple tv and my modem.  still the same issue and same error message.  any ideas?