VPN connectivity with Xfinity continually dropping!

I have had xfinity for several years and am using a gig speed connection. But lately (in the last 6 months or so), my company's vpn connection keeps dropping.  It doesn't matter whether I am wired or wireless, I continue to have the same issues.  Some days, it is even worse wired than wireless.  I have checked repeatedly with our IT and they have said that the vpn is working fine, and that the issue must be with my provider.  There appears to be no rhyme or reason to when the connection will drop or how it can be reconnected.  I might go hours without an issue, only to have it drop and not be able to reconnect for hours, even though my connection to the home network is still showing connected.  Here is what I have tried so far.....  Need to get this fixed asap as it is essential to my job.

• I have checked and rechecked all connections
• I have rebooted both the computer and router often - no effect
• I have disabled Advanced Security
• I have tried working using Bridge mode.
• I have connecting directly to the router with no other connections.
• I have tried removing and reinstalling the VPN application (Global Protect).