Timeout Error while uploading files to S3 Bucket using OpenShift Cluster

Hi AWS, I have a shell script in AWS OpenShift and it is having worker nodes backed by EC2 instances. The purpose of the script is to upload the files in Amazon S3 bucket. Having said that the job works fine in the morning but giving timeout errors during afternoon and night time which seems to be a weird issue. One more thing is the S3 bucket lives in another AWS account and both the bucket and the OpenShift cluster are in the ca-central-1 region.

Can you please help me figure out what is the reason behind this. At first glance I thought it's a proxy issue similar to AWS Lambda but I am not sure if that's really the case.

Please guide.