How often are connections refreshed?

I have a very specific issue I am facing with my integration with the API. I am storing connections in my database and trying to keep them in sync with my bank with the user i have created in moneyhub. But after setting up consent, I see that some of the connections are deleted for my user and i had to go through the consent setup workflow again with a new connection id, as my old connection became stale now. I also note that its not 90 days past for the consent to expire either.May I ask why this is the case and is there any refresh happening on moneyhub side with regards to this?