Hi @Mohammed Akbar Pasha,
You may first check if the issue is related with SSRS.
You may check the execution log to see which step makes the report stuck.
Also you may use below tools to monitor.
Monitor report server performance
However, you are using SSRS in Dynamics AX, not sure if the issue is also related with it.
I'd like to suggest that you may contact Microsoft with the two team to do further assistance or suggestion.
Regards,
Zoe Hui
If the answer is helpful, please click "Accept Answer" and upvote it.