you’re welcome @Sgram, unfortunately I don’t know a way to stop this automation. You could create automation that would enroll closed tickets and if they reopen within a set delay (whatever timeframe is reasonable for you, 30 days, 60, 365, etc.) then you could close the conversation again.
Before doing this, I would review your process to determine if tickets are being closed before they’re complete or if the last reply that closes the ticket is encouraging a reply from the customer. You could even include a link to open a new ticket should they need anything further, preventing them from reopening closed tickets/conversations.
If you can figure out what’s driving the customer behavior to reopen these conversations you can likely put a process in place to prevent most of them - my fear would be that you auto-close a ticket that was reopened and miss a critical communication from a customer.