Siri Suggestions Notifications is a resource hog
On my iPhone 16 Pro running iOS 26.0.1, I have discovered that Siri Suggestions Notifications are using about 20% of the battery during the day and about 1GB of cell data per month. I turned Allow Notifications off in Siri Suggestions to fix the problem, and to be honest I don't miss the feature much so I'm fine.
But I want to mention this in case someone has an idea of how to resolve this issue and also to let others know in case they are experiencing this too.
iPhone 16 Pro, iOS 26