Cannot connect to the OLAP source - when Scheduling WebI Report

Hi,
I am confused by seeing the above mentioned error on random days....
Scenario - WebI report scheduled daily:
Some days the report works fine and other days  it is not processing correctly but gives me this error message "Cannot connect to the OLAP source".
Our connection is via BICS and it is SSO. Data Source is BW and we use BEX.
Person who scheduled report has admin rights, our version is 4.0 SP7 P5.
Please advise if anyone has faced this issue and if there is a solution, did try the community but only found that the key store was a problem but that was previous versions.
Any help or input is much appreciated.
Kind regards,
Sarat.

Hi Sarat,
This problem can occur for multiple different reasons, so it's hard to give an advice for such symptom. Could you look at trace files from SemanticLayer component (it is hosted in APS with DSLBridge service), you should find clearer errors which can then be analyzed. There is no need to activate logs if it is still at level 'Unspecified', errors have level high enough to be output by default.
Regards,
Loic

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