Hi,
Thanks for your reply!
As i said most of the time it comes up again, but it takes up to a minute.
The time is absolute in sync 
…
Once i read somewhere that it is better to use UDP over TCP when creating N2N tunnels with OpenVPN. Do you think im wrong here and that we should switch over to TCP?
If so, can i do it step by step, from tunnel to tunnel?
Here comes the log file:
# IPFire n2n Open VPN Server Config by ummeegge und m.a.d
# User Security
user nobody
group nobody
persist-tun
persist-key
script-security 2
# IP/DNS for remote Server Gateway
remote pw-MYSITE.MYDOMAIN.de
float
# IP adresses of the VPN Subnet
ifconfig 192.168.190.1 192.168.190.2
# Client Gateway Network
route 192.168.124.0 255.255.255.0
up "/etc/init.d/static-routes start"
# tun Device
dev tun
#Logfile for statistics
status-version 1
status /var/run/openvpn/PWMYSITE-n2n 10
# Port and Protokol
port 1200
proto udp
# Paketsize
tun-mtu 1500
fragment 1300
mssfix
# Auth. Server
tls-server
ca /var/ipfire/ovpn/ca/cacert.pem
cert /var/ipfire/ovpn/certs/servercert.pem
key /var/ipfire/ovpn/certs/serverkey.pem
dh /var/ipfire/ovpn/ca/dh1024.pem
# Cipher
cipher AES-256-CBC
# HMAC algorithm
auth SHA512
# Debug Level
verb 3
# Tunnel check
keepalive 10 60
# Start as daemon
daemon PWMYSITEn2n
writepid /var/run/PWMYSITEn2n.pid
# Activate Management Interface and Port
management localhost 1200
Greetings!