VPN Netgear FVG318 to Cisco PIX drops connection after 5 minutes of inactivity.

I'm not sure why this netgear is acting differently then the FVS318
routers I have out there but currently I can make a connection and
keep it alive by sending a constant string of pings through it but if
I do not I recieve this from the Netgear:

--------Initial connection:
Init Cookie: 0xecd501ce27778a2f & Resp Cookie: 0xcafea19a6796fc0c
INFO :: Initiator SPD selectors sent: IP SUBNET, 192.168.10.0, mask 24
proto 0, port 0
Init Cookie: 0xecd501ce27778a2f & Resp Cookie: 0xcafea19a6796fc0c
INFO :: Responder SPD selectors sent: IP SUBNET, 192.168.5.0, mask 24
proto 0, port 0
Init Cookie: 0xecd501ce27778a2f & Resp Cookie: 0xcafea19a6796fc0c
INFO :: IKE phase-II started of message ID d341e23b
Init Cookie: 0xecd501ce27778a2f & Resp Cookie: 0xcafea19a6796fc0c
INFO :: Notify payload of notify type RESPONDER_LIFETIME with protocol
ESP or AH received
Init Cookie: 0xecd501ce27778a2f & Resp Cookie: 0xcafea19a6796fc0c
INFO :: Received Notify Type RESPOND_NOTIFY with 28800 seconds
Init Cookie: 0xecd501ce27778a2f & Resp Cookie: 0xcafea19a6796fc0c
INFO :: Received Notify Type RESPOND_NOTIFY with 4608000 Kilo Bytes
Init Cookie: 0xecd501ce27778a2f & Resp Cookie: 0xcafea19a6796fc0c
INFO :: Quick Mode completed with message ID(0xd341e23b)
-----after 5 minutes
Init Cookie: 0xecd501ce27778a2f & Resp Cookie: 0xcafea19a6796fc0c
INFO :: Sending phase-I notify of type R_U_THERE
Init Cookie: 0xecd501ce27778a2f & Resp Cookie: 0xcafea19a6796fc0c
INFO :: received NOTIFY PAYLOAD of notify type R_U_THERE_ACK
Init Cookie: 0xecd501ce27778a2f & Resp Cookie: 0xcafea19a6796fc0c
INFO :: Sending phase-I notify of type R_U_THERE
Init Cookie: 0xecd501ce27778a2f & Resp Cookie: 0xcafea19a6796fc0c
INFO :: Sending phase-I notify of type R_U_THERE
Init Cookie: 0xecd501ce27778a2f & Resp Cookie: 0xcafea19a6796fc0c
INFO :: Sending phase-I notify of type R_U_THERE
Init Cookie: 0xecd501ce27778a2f & Resp Cookie: 0xcafea19a6796fc0c
INFO :: Deleting the IsakmpSA
Init Cookie: 0x063b2d5ee11db355 & Resp Cookie: 0x0000000000000000
INFO :: IKE phase-I negotiation started
Init Cookie: 0x063b2d5ee11db355 & Resp Cookie: 0xcafea19a6a988f99
INFO :: Sending phase-I notify of type INITIAL_CONTACT
Init Cookie: 0x063b2d5ee11db355 & Resp Cookie: 0xcafea19a6a988f99
INFO :: Received DELETE PAYLOAD of protocol ESP detected with SPI :
0xca86316,
Init Cookie: 0x063b2d5ee11db355 & Resp Cookie: 0xcafea19a6a988f99
HASH PAYLOAD :: Mismatching hash values in the received message
Init Cookie: 0x063b2d5ee11db355 & Resp Cookie: 0xcafea19a6a988f99
INFO :: Sending phase-I notify of type AUTHENTICATION_FAILED
Init Cookie: 0x063b2d5ee11db355 & Resp Cookie: 0xcafea19a6a988f99
INFO :: Phase-I negotiation failed
Init Cookie: 0x063b2d5ee11db355 & Resp Cookie: 0xcafea19a6a988f99
INFO :: Deleting the IsakmpSA
-------If from here I ping from the netgear and a connection is re-
established.


>From the Cisco's PIX 506e version 6.3(5) Pdm there are no errors
listed but the connection counts reset to zeros.

Has any one seen this before? or know where I may have messed things
up?

Cisco configureation addition:

name 192.168.10.0 VPN_FVG318
access-list FVG318_VPN permit ip 192.168.5.0 255.255.255.0 VPN_FVG318
255.255.255.0
access-list 100 permit ip 192.168.5.0 255.255.255.0 VPN_FVG318
255.255.255.0
crypto map newmap 35 ipsec-isakmp
crypto map newmap 35 match address FVG318_VPN
crypto map newmap 35 set peer xxx.xxx.xxx.xxx
crypto map newmap 35 set transform-set esp-3des-md5
isakmp key $0lut10n$ address xxx.xxx.xxx.xxx netmask 255.255.255.255
no-xauth no-config-mode