Watchguard Mobile User VPN-Timeout?

I am a remote user and have Watchguard Mibile User VPN. Each day after being connected about 8.5 – 9 hours, I loose the VPN for a short time. It does reconnect, but some of the programs I have open that use the home office database have to be rebooted. I’ve been told my our IT manager that we do not have any limit to connect time, but since this has gone on for about 2 years and I’ve changed ISP’s with no improvement, there must be some setting that is not correct.
Any input would be most welcome.. thanks in advance