Reporting Services TempDB keeps going into restoring mode
Why are you running a log backup job on [ReportServerQA5TempDB]? It should be in simple mode.

From MSDN:


  ReportServerTempdb is created with the primary report server database and is used to store temporary data, session information, and cached reports.


and


  Use the simple recovery model to backup the reportservertempdb database.


Now the real question becomes, "What are you using for your backups?" Check to make sure that it's not changing the recovery model and that ReportServerTempDB is still in SIMPLE recovery model.

    SELECT name, recovery_model_desc
        FROM sys.databases;


I wonder if your solution is trying to switch back and forth between recovery models and is failing somewhere along the way. I have a vague recollection of this having happened to me in the past. 

Try changing the recovery model to Simple and removing it from your hourly log backup job.

ALTER DATABASE ReportServerQA5TempDB SET RECOVERY SIMPLE;
GO