Created attachment 1436745 [details]
logs and configuration files

Description of problem:
When Bricks Details page is open for a few minutes there usually is received response:
{"errors":{"message":"Invalid JSON received."}}
from `[hostname]/api/1.0/clusters/[cluster-id]/volumes/[volume-id]/bricks` API call. After this response is received the page stops to call this API call and user is shown blank page with no bricks.
This is shown in /var/log/tendrl/error.log.

Version-Release number of selected component (if applicable):
tendrl-ansible-1.6.3-3.el7rhgs.noarch
tendrl-api-1.6.3-3.el7rhgs.noarch
tendrl-api-httpd-1.6.3-3.el7rhgs.noarch
tendrl-commons-1.6.3-4.el7rhgs.noarch
tendrl-grafana-plugins-1.6.3-2.el7rhgs.noarch
tendrl-grafana-selinux-1.5.4-2.el7rhgs.noarch
tendrl-gluster-integration-1.6.3-2.el7rhgs.noarch
tendrl-monitoring-integration-1.6.3-2.el7rhgs.noarch
tendrl-node-agent-1.6.3-4.el7rhgs.noarch
tendrl-notifier-1.6.3-2.el7rhgs.noarch
tendrl-selinux-1.5.4-2.el7rhgs.noarch
tendrl-ui-1.6.3-1.el7rhgs.noarch
glusterfs-3.12.2-9.el7rhgs.x86_64

How reproducible:
40%

Steps to Reproduce:
1. Import cluster with volume to WA.
2. Open Volumes page.
3. Click on the listed volume.
4. Brick page for selected volume is shown. Open console for the web (firebug).
5. Wait for few minutes.

Actual results:
There is repeatedly called `[hostname]/api/1.0/clusters/[cluster-id]/volumes/[volume-id]/bricks`. After a while one of the API calls return {"errors":{"message":"Invalid JSON received."}} and UI page goes blank.

Expected results:
There should be no random `Invalid JSON received.` messages.

Additional info:
In attached configuration and log files is described cluster that was freshly imported but it seems that the issue occurs more often when there is activity on the volume like inserting data.