Why do I get logged out of my Cloud Fusion Applications session at a similar time every day?

Can anyone please tell me why our hosted Fusion Apps pods logs all users out of our sessions, regardless of what we're in the middle of doing.

This normally happens between 4pm and 5pm GMT. This has happened since we started using hosted Fusion apps back in late 2019 and no-one has managed to explain why this is enforced… Surely there is a setting somewhere that can be changed?

Does any other customer experience the same?