Thanks for letting us know. Just to confirm, are your subs reporting that notifications are not being sent out or that your videos aren't showing up in their subs feed? Also, make sure that you have checked "Notify subscribers" under advanced settings. Let us know.
Thanks for confirming. Could you check if your subs have enabled to receive "all notifications" as they may be on the default setting, which is to receive notifications occasionally. Here's more info: https://goo.gl/Lnpuvu . Keep us posted.