How to keep my pod running (not get terminate/restart) in EKS - kubernetes

Question

I am trying to use AWS EKS (fargate) to run automation case, but some pods (9 out of 10 times running) get terminated, makes automation failure.
I have a bunch of automation cases written in robotframework, the case itself is running well, but it is time-consumming, usually need 6 hours for a round. So, I think I can use K8S to run the cases in-parallel, therefore save time, I use Jenkins to config how many 'automations' run in-parallel, and after all done, merge and present the test result.
But some pods aften get terminated,
command "kubectl get pod", return something like this (I set the "restartPolicy: Never" to keep the error pod to 'describe' its info, otherwise, the pod just gone)
box6 0/1 Error 0 9m39s
command "kubectl describe pod box6" get output like following (masked some private information).
Name: box6
Namespace: default
Priority: 2000001000
Priority Class Name: system-node-critical
Node: XXXXXXXX
Start Time: Mon, 21 Dec 2020 15:29:37 +0800
Labels: eks.amazonaws.com/fargate-profile=eksautomation-profile
name=box6
purpose=demonstrate-command
Annotations: CapacityProvisioned: 0.25vCPU 0.5GB
Logging: LoggingDisabled: LOGGING_CONFIGMAP_NOT_FOUND
kubectl.kubernetes.io/last-applied-configuration:
{"apiVersion":"v1","kind":"Pod","metadata":{"annotations":{},"labels":{"name":"box6","purpose":"demonstrate-command"},"name":"box6","names...
kubernetes.io/psp: eks.privileged
Status: Failed
IP: 192.168.183.226
IPs:
IP: 192.168.183.226
Containers:
box6:
Container ID: XXXXXXXX
Image: XXXXXXXX
Image ID: XXXXXXXX
Port: <none>
Host Port: <none>
Command:
/bin/initMock.sh
State: Terminated
Reason: Error
Exit Code: 143
Started: Mon, 21 Dec 2020 15:32:12 +0800
Finished: Mon, 21 Dec 2020 15:34:09 +0800
Ready: False
Restart Count: 0
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-tsk7j (ro)
Conditions:
Type Status
Initialized True
Ready False
ContainersReady False
PodScheduled True
Volumes:
default-token-tsk7j:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-tsk7j
Optional: false
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute for 300s
node.kubernetes.io/unreachable:NoExecute for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Warning LoggingDisabled <unknown> fargate-scheduler Disabled logging because aws-logging configmap was not found. configmap "aws-logging" not found
Normal Scheduled <unknown> fargate-scheduler Successfully assigned default/box6 to XXXXXXXX
Normal Pulling 5m7s kubelet, XXXXXXXX Pulling image "XXXXXXXX"
Normal Pulled 2m38s kubelet, XXXXXXXX Successfully pulled image "XXXXXXXX"
Normal Created 2m38s kubelet, XXXXXXXX Created container box6
Normal Started 2m37s kubelet, XXXXXXXX Started container box6
I did some search upon the error, error code 143 is 128+SIGTERM, I am doubting that the pod get killed by EKS intentionally.
I cannot config the pod to have it restart, because if so, the automation case cannot resume, therefore makes the effort useless (not able to save automation running time).
I have tried to enable cloud watch, hoping to get a clue upon why pod get terminated, but no clue.
Why my pod get terminated by EKS? how should I troubleshooting upon it? how should I avoid it?
Thanks for your help.