Online accounts needs Google re-authorization every few weeks

I have set up a Google account in Online Accounts app. Every few weeks there is a notification that applications can no longer access it and it needs re-authorization. I don't know if this is by design.

When I set up the account, Ubuntu should remember it forever until I disable the account or change my credentials in Google.

It is bad usability that the account must be re-authorized and causes users not to use the feature. I understand this increases security, but mandatory re-authorization every few weeks is way too often from user's point of view.

Is this a bug or feature?