This is now a known issue now and randomly user's PDI is getting offline for maintenance work and the PDI team has not yet provided an ETA for its resolution.
Backend maintenance is currently in progress in your PDI, and your instance will be up and running once the maintenance is completed.Wait for the instance till it is up if you do not have any urgent work .
As mentioned in the Community Admin’s response in the : PDI offline thread, the team is proactively coordinating with the PDI team to resolve the issue as soon as possible, given that direct support for PDI is not available.
If you have urgent work, in that case , you can leverage using related Lab instance Else Release your instance and request for new (Australia).
