ZD 1200 Web UI stops responding after 30-60 seconds when connected to customers LAN

[rob_deal]

ZD 1200 running latest 9.10 firmware.

6 x 7372 AP's connected via Cisco SG300-10 PoE switch.

I have tried different IP's on the same LAN.

I have tried putting the ZD in a DMZ and restricted firewall access to it.

Cyberoam CR100iNG firewall.

Juniper EX4400 (x5 in virtual chassis)

If the ZD is not connected to the customers LAN, it works without issue.

Suggestions please.

[munish_munish]

Rob, 

Please open a support case .

BR,
munish

[rob_deal]

Case ID: 00287817