504 Gateway Timeout with reverse proxy

[ransom3910]

Home Assistant release (hass --version):
0.38.3
Python release (python3 --version):
Python 3.4.2

Description of problem:
I am using apache as a reverse proxy to HA. It was working fine until the last upgrade to .38.3 from .34
Now I am occasionally getting a 504 Gateway Timeout error when going through the reverse proxy. I did a TCP dump from the proxy and can see it is taking to HA during the issue. It is intermittent. Any thoughts on what might be causing this would be appreciated.

Apache Info
Server version: Apache/2.4.18 (Ubuntu)
Apache Config

<VirtualHost *:80>
ProxyTimeout 30 - I added this line to see if it would help. I have tried high and low times outs with no luck.
ProxyPreserveHost On
ProxyRequests Off
ServerName site.mydomain.com
ProxyPass /api/websocket ws://192.168.20.5:8123/api/websocket
ProxyPassReverse /api/websocket ws://192.168.20.5:8123/api/websocket
ProxyPass / http://192.168.20.5:8123/
ProxyPassReverse / http://192.168.20.5:8123/

[robbiet480]

Closing in favor of #5954, please search issues next time before opening a new one, thanks!