A warm welcome here in the Roku Community, @721!
Thank you for reaching out regarding this matter. We'd be more than happy to find you the best resolution possible.
We should also have to take into consideration the number of devices linked to your Wi-Fi, even in the event that your network connection is excellent. It may be possible that your signal strength is slow during the night.
We also highly recommend reaching out to your Internet Service Provider for further clarification and assistance.
Best regards,
Carly
Carly Y.
Roku Community Moderator