Getting unexpected end of stream when calling okta api using java sdk

In our project we are using Java SDK to talk to okta. and this is how we are creating the client:
oktaClient = Clients.builder()
.setOrgUrl(oktaUrlDomain)
.setClientCredentials(new TokenClientCredentials(oktaApiToken))
.setRetryMaxAttempts(5)
.build();

and our backend server is running on AWS EC2server. and we are facing this error intermittently.

om.okta.commons.http.HttpException: unexpected end of stream on https://identity-nonprod.energyaustralia.com.au/
at com.okta.commons.http.okhttp.OkHttpRequestExecutor.executeRequest(OkHttpRequestExecutor.java:142) ~[okta-http-okhttp-1.2.5.jar:1.2.5]
at com.okta.commons.http.RetryRequestExecutor.doExecuteRequest(RetryRequestExecutor.java:147) ~[okta-http-api-1.2.5.jar:1.2.5]
at com.okta.commons.http.RetryRequestExecutor.executeRequest(RetryRequestExecutor.java:120) ~[okta-http-api-1.2.5.jar:1.2.5]
at com.okta.sdk.impl.ds.DefaultDataStore.execute(DefaultDataStore.java:457) ~[okta-sdk-impl-4.0.0.jar:4.0.0]
at com.okta.sdk.impl.ds.DefaultDataStore.lambda$getResourceData$2(DefaultDataStore.java:210) ~[okta-sdk-impl-4.0.0.jar:4.0.0]
at com.okta.sdk.impl.ds.DefaultFilterChain.filter(DefaultFilterChain.java:47) ~[okta-sdk-impl-4.0.0.jar:4.0.0]
at com.okta.sdk.impl.ds.cache.WriteCacheFilter.filter(WriteCacheFilter.java:34) ~[okta-sdk-impl-4.0.0.jar:4.0.0]
at com.okta.sdk.impl.ds.DefaultFilterChain.filter(DefaultFilterChain.java:52) ~[okta-sdk-impl-4.0.0.jar:4.0.0]
at com.okta.sdk.impl.ds.cache.ReadCacheFilter.filter(ReadCacheFilter.java:42) ~[okta-sdk-impl-4.0.0.jar:4.0.0]
at com.okta.sdk.impl.ds.DefaultFilterChain.filter(DefaultFilterChain.java:52) ~[okta-sdk-impl-4.0.0.jar:4.0.0]
at com.okta.sdk.impl.ds.DefaultDataStore.getResourceData(DefaultDataStore.java:222) ~[okta-sdk-impl-4.0.0.jar:4.0.0]
at com.okta.sdk.impl.ds.DefaultDataStore.getResource(DefaultDataStore.java:178) ~[okta-sdk-impl-4.0.0.jar:4.0.0]
at com.okta.sdk.impl.client.DefaultClient.getUser(DefaultClient.java:2510) ~[okta-sdk-impl-4.0.0.jar:4.0.0]
at au.com.energyaustralia.selfservice.service.OktaServiceImpl.searchUserByIdOrEmail(OktaServiceImpl.java:65) [classes/:?]

Any one any idea what we should do?

@pegahk It looks like a connection issue.
Can you please refer the fix here and see if it is helpful?