Hello Sreeja,
By default the restart policy is Always for ACI as per this link. You may wat to set the Restart Policy to Never or OnFailure. You can set it during ACI creation via Portal from Advanced tab or use --restart-policy flag if you create the ACI via CLI.
More details here about restart policies in ACI.
I hope this is helpful. If any clarification needed, let me know and I will do my best to answer.
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Thank you!