On Friday 6th March, Toei Animation released a notice which stated that their internal system was hacked by a third party. According to the notice, their system is temporarily suspended.

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Furthermore, they also say that due to this attack the broadcasting of the anime will be delayed. It’s still known how much time it will delay. The minimum time is a week but it can take more than that.
Well, the anime which are going to be delayed is “Dragon Quest Dai no Daibouken”, “Delicious Party ♡ Precure”, “Digimon Ghost Game”, and “ONE PIECE”.
Below you can read the official letter of apology from Toei Animation:
We confirmed that our network was illegally accessed by a third party on March 6, this year, and have suspended part of our internal system.
Details are currently under investigation, but it has been revealed that it will affect the airing schedule of our TV animations “Dragon Quest Dai no Daibouken”, “Delicious Party ♡ Precure”, “Digimon Ghost Game”, and “ONE PIECE”. increase.
We deeply apologize to all the long-awaited fans for their concern every week.
Toei Animation
Source: Toei Animation Official Website