Unstable WLAN/VPN

I have the following problem:

When connected to the Internet with WLAN together
with VPN, the WLAN-connection gets interrupted
from time to time due to physical properties of
the WLAN-Connection (high distance between antennas, also
termal effects/weather seem to play a role).
Those interruptions occur approximately each 2h.

In consequence, the VPN-connection gets interrupted
as well.

Whereas the WLan connection gets re-established automatically after
a few seconds, the VPN connection needs a password and username to
reconnect.

This is quite frustrating, because when i run some program(e.g. server), it
gets
disconnected after 2h, and i cant't use it any more without manually
reconnecting the VPN.

Is there a workaround? For example a script that does the job of
reconnecting the vpn client,
when the VPN connetion has been closed?
Let's assume, that security issues don't play a role.
I use the cicsco VPN Client.

Thx in advance