Even though Twitch might not always give clear reasons for sudden host interruptions, there are a number of reasons why these happen and ways to get back to hosting the same channel without any problems.
Technical problems like platform glitches or server problems, changes in the hosted channel's status (like going offline or being suspended), or violations of Twitch's hosting rules (like hosting channels that are spamming or acting inappropriately) are all things that could cause interruptions.
To safely start hosting again, it's important to check the channel's status on Twitch or social media to see if there are any problems. Also, think about when and how long the hosting will last to be fair to other viewers. Pay attention to the content you're promoting, since you're in charge of it. Talk to your audience about the decision to re-host, which will build trust and openness.
As extra safety advice, don't host channels with inappropriate content and don't join in with annoying "host chains." Use Twitch's reporting tools to let the platform know if you see anything fishy happening while hosting.
By following these rules and being aware of possible problems, you can safely host your chosen channel again and make sure your viewers have a good time while still upholding Twitch's community values. Respect and openness are very important in this process.
If you think there's more to that can be added, feel free to share it with us in the comments.