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VPN client intermittent connection to ASA5520 with Raason 427 message

VPN client v4.8.02

ASA 5520 v7.08

It looks like sometimes there is a problem in IKE Phase 2 phase establishement.

VPN client pops up then the

Reason 427: Unknown error occured at peer

Could it be a problem of VPN tunnel ip addr assignememt?

VPN tunnel range is

LAN ASA interface has ip-addr, and it is a default gateway for the VPN tunnel.

Other ASA interf has public ip addr.

USer is authenticating through Radius server, which is abailable over private interface

User is always asked for id and password. When the VPN connection fails , Radius server clains that he could not match the login and password. I belive because the VPN tunnel ip address was not assigned due to some miscongiuration in IPSec rules?

Does it ring a bell?

It makes me crazy that it works on time out of 5 and I cannot explain why?

Many thanks in advance

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