UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36

Steps to reproduce the problem:
1. get many participants (20-40 people) to involve with STT and translate using Google APIs to test the load
2.  Observe and will notice the STT and Translation stream stopped working some points during the 20-30 minutes conversation
3. 

What is the expected behavior?

What went wrong?
today we did some control load testing.  We had up to 20 people using the service at the same time or 40 participants.  3 times the stream from Google APIs stopped.  After about 5 seconds the streams started working again.  We need to make sure this can scale.  Below is the error we got and was wondering if anyone had any insight it to why this happened when we got up to 40 streams at the same time. 

This is what's returned from the gce instance:
{"code":8,"metadata":{"_internal_repr":{"google.rpc.help-bin":[{"type":"Buffer","data":[10,111,10,32,71,111,111,103,108,101,32,100,101,118,101,108,111,112,101,114,32,99,111,110,115,111,108,101,32,65,80,73,32,107,101,121,18,75,104,116,116,112,115,58,47,47,99,111,110,115,111,108,101,46,100,101,118,101,108,111,112,101,114,115,46,103,111,111,103,108,101,46,99,111,109,47,112,114,111,106,101,99,116,47,51,56,50,54,48,55,49,56,53,52,55,51,47,97,112,105,117,105,47,99,114,101,100,101,110,116,105,97,108]}],"grpc-status-details-bin":[{"type":"Buffer","data":[8,8,18,156,1,73,110,115,117,102,102,105,99,105,101,110,116,32,116,111,107,101,110,115,32,102,111,114,32,113,117,111,116,97,32,39,68,101,102,97,117,108,116,95,71,114,111,117,112,39,32,97,110,100,32,108,105,109,105,116,32,39,67,76,73,69,78,84,95,80,82,79,74,69,67,84,45,49,48,48,115,39,32,111,102,32,115,101,114,118,105,99,101,32,39,115,112,101,101,99,104,46,103,111,111,103,108,101,97,112,105,115,46,99,111,109,39,32,102,111,114,32,99,111,110,115,117,109,101,114,32,39,112,114,111,106,101,99,116,95,110,117,109,98,101,114,58,51,56,50,54,48,55,49,56,53,52,55,51,39,46,26,152,1,10,35,116,121,112,101,46,103,111,111,103,108,101,97,112,105,115,46,99,111,109,47,103,111,111,103,108,101,46,114,112,99,46,72,101,108,112,18,113,10,111,10,32,71,111,111,103,108,101,32,100,101,118,101,108,111,112,101,114,32,99,111,110,115,111,108,101,32,65,80,73,32,107,101,121,18,75,104,116,116,112,115,58,47,47,99,111,110,115,111,108,101,46,100,101,118,101,108,111,112,101,114,115,46,103,111,111,103,108,101,46,99,111,109,47,112,114,111,106,101,99,116,47,51,56,50,54,48,55,49,56,53,52,55,51,47,97,112,105,117,105,47,99,114,101,100,101,110,116,105,97,108]}]}}}

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