Jessie is only a week old... that doesnt fix the problem, but its a
good excuse for why it might happen
possibly, you upgraded to Jessie, rather than did a clean install ?
If thats the case, you may need to upgrade the system.
there is a bug report, here >> https://bugs.debian.org/cgi-bin/bugr...cgi?bug=720604
which may explain the problem youre having