Metadata from 7K samples

I'm trying to copy the bam index metadata from GenomeStrip_Kathiresan_VIRGO_MESA_TAICHI_Hg19bams for ~7600 samples into another workspace with the same samples (clone of GenomeStrip workspace's parent).

First I tried to import the metadata by copying from another workspace. After I choose the workspace and the "sample" category, it times out loading entities:
Code: 504
Occurred: June 22, 2017, 10:23 AM EDT
Source: FireCloud

Next I tried to download the metadata from the other workspace which timed out in a different way:
{
"statusCode": 500,
"source": "FireCloud",
"timestamp": 1498141220135,
"causes": [],
"exceptionClass": "akka.pattern.AskTimeoutException",
"stackTrace": [{
"className": "akka.pattern.PromiseActorRef$$anonfun$1",
"methodName": "apply$mcV$sp",
"fileName": "AskSupport.scala",
"lineNumber": 604
}, {
"className": "akka.actor.Scheduler$$anon$4",
"methodName": "run",
"fileName": "Scheduler.scala",
"lineNumber": 122
}, {
"className": "scala.concurrent.Future$InternalCallbackExecutor$",
"methodName": "unbatchedExecute",
"fileName": "Future.scala",
"lineNumber": 601
}, {
"className": "scala.concurrent.BatchingExecutor$class",
"methodName": "execute",
"fileName": "BatchingExecutor.scala",
"lineNumber": 109
}, {
"className": "scala.concurrent.Future$InternalCallbackExecutor$",
"methodName": "execute",
"fileName": "Future.scala",
"lineNumber": 599
}, {
"className": "akka.actor.LightArrayRevolverScheduler$TaskHolder",
"methodName": "executeTask",
"fileName": "LightArrayRevolverScheduler.scala",
"lineNumber": 322
}, {
"className": "akka.actor.LightArrayRevolverScheduler$$anon$4",
"methodName": "executeBucket$1",
"fileName": "LightArrayRevolverScheduler.scala",
"lineNumber": 274
}, {
"className": "akka.actor.LightArrayRevolverScheduler$$anon$4",
"methodName": "nextTick",
"fileName": "LightArrayRevolverScheduler.scala",
"lineNumber": 278
}, {
"className": "akka.actor.LightArrayRevolverScheduler$$anon$4",
"methodName": "run",
"fileName": "LightArrayRevolverScheduler.scala",
"lineNumber": 230
}, {
"className": "java.lang.Thread",
"methodName": "run",
"fileName": "Thread.java",
"lineNumber": 745
}],
"message": "Ask timed out on [Actor[akka://FireCloud-Orchestration-API/user/IO-HTTP#-1398533727]] after [60000 ms]. Sender[null] sent message of type \"spray.http.HttpRequest\"."
}

I tried the download approach on a workspace with ~20 samples and it worked fine. Is this due to the workspace service disruptions or because I have too many samples?

Thanks,
Laura