Is it possible to prevent a ticket from closing after 28 days in a Solved status?
No, it is not possible to prevent a ticket from changing to a Closed status after spending 28 days in a Solved status. This is a system rule that can not be adjusted or altered through the use of automations and triggers.
As the rule for closing tickets after 28 days only applies to tickets in a Solved status, a good workaround to prevent tickets from closing would be to utilize the On-hold status. The On-hold status will allow users to keep tickets beyond 28 days, without keeping them in an Open or Pending status. Tickets with the On-hold status are not affected by the system close rule, and are allowed to remain in this status indefinitely.
For more information on Closed tickets please visit What is the difference between a Solved ticket and a Closed ticket?.