Looks like Cortana's interests are down......

[Megsh]

In my Lumia 520 Cortana's interests aren't working at all, while other things in my phone is just working fine.... Is it down in ur phones too????

 

[jlzimmerman]

Mine is working splendidly. My only gripe is that "Hey, Cortana" half the time doesn't wake my phone from the lockscreen/inactive screen.

 

[Rasetech]

I have the same problem than you, both in WP8.1 and W10TP