DPR-ERR-2079 Firewall Security Rejection error while validating the report

[dumbell]

Hello Everyone,

I have a report with 2 explicit joins and around 12 query subjects arranged in 4 queries.
The report seems to be very unstable and gives the stated error sometimes and sometimes validates fine.
Thought that it may be the underlying joins. Tested all of those involved and they are working fine.

Can you guys please let me know why this error comes up once in a while.

We know that its a join problem but are not able to pin point it.

Thank you

Dumbell