You will have to try the following:
The cause of the error is report retrieving huge data.
-See if you can put some mandatory filters on the report so that you filter out data
-Go to CMC and set the “idle time out” connection setting to 20 from 60
and the other fixes for this is mentioned in the below link:
https://bobj-board.org/t/204292
Achilies 
(BOB member since 2008-12-04)