express-admin is not responded and throws Error: read ECONNRESET on GAE

[luongvo]

I got an issue when deploying an Nodejs app + express-admin on Google App Engine. The app works perfectly after deployed. But, after a moment later (maybe 2-5hrs), it can not go to the listview pages of my models, the page displayed Internal Server Error and got this error in the log:

2016-10-17 15:43:58 default[20161017t144903]  GET /_ah/health 404 0.522 ms - 1356
2016-10-17 15:44:02 default[20161017t144903]  GET /_ah/health 404 0.540 ms - 1356
2016-10-17 15:44:02 default[20161017t144903]  GET /admin/Emojis 500 14.577 ms - 22
2016-10-17 15:44:02 default[20161017t144903]  Error: read ECONNRESET
2016-10-17 15:44:02 default[20161017t144903]      at exports._errnoException (util.js:870:11)
2016-10-17 15:44:02 default[20161017t144903]      at TCP.onread [as _originalOnread] (net.js:544:26)
2016-10-17 15:44:02 default[20161017t144903]      at TCP.<anonymous> (/app/node_modules/@google/cloud-trace/node_modules/continuation-local-storage/node_modules/async-listener/glue.js:188:31)
2016-10-17 15:44:03 default[20161017t144903]  GET /_ah/health 404 0.817 ms - 1356
2016-10-17 15:44:07 default[20161017t144903]  GET /_ah/health 404 0.610 ms - 1356

From this time, I can not goto listview pages anymore, but the root admin page mainview is still okay.