L2TP/IPSec No traffic when a second user connects

This issue is intermittent, seems to be happening when the first user has been logged for more that 1 hour.

Balance 305/Firmware 8.0.2

L2TP/IPSec works fine with a single user. When a second user connects the connection is not able to receive any traffic in user 2, however user 2 is able to ping user 1 but nothing on the local network.

VPN user-1 - connected (works normally)
VPN user-2 - connected (won’t receive any data)
Can ping user1. Can’t ping anything on local network.

Thank you.