RV320 slow DHCP

We have a RV320 router. To our knowledge, we use it with out-of-the-box setings, all clients get the LAN ip-address via DHCP from the RV320.
The problem is the time it takes for the RV320 to hand out an ip-adress, it takes between 1-2 minutes, both in the case when a new client is connected and in the case when a client is re-booting and initates a new request.
We are usung the latest firmware v1.1.1.06.

I Martin,
We have same problem with RV320. There are only about 20 APs requiring an IP. Most of the times, the APs reboots.
Tried also with RV180. Analysed with wireshark, the clients lauched DHCP requests 5 times before RV started to answer. If the client (APs in this case) have a timeout for getting IP, then reboot themselfs most of the times before the RV routers started to respond.
Thanks in advance,
Raúl.

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Serial Number:
Firmware Version:
v1.1.1.06 (2013-12-06, 11:02:37)
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Dear sir,
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