Authenticate with streaming apps on FireStick

I was told 'go ahead and buy a FireStick and you can get rid of your set top box and use the Xfinity Stream app'.  OK, I now know that's wrong (grrr) but I committed to the FireStick and it's still pretty useful.  BUT...  I use probably 15+ apps for various channels and services that require authentication through Xfinity.  Some of the apps require re-authentication with Xfinity EVERY DAY!  Gets pretty frustrating.  Some apps only requrie re-authentication every week or so.

So my quetsion is, How do I stop this constant re-authentication, or at least stretch the time to several weeks or months?  Some articles say it's app specific, some say it's the provider.  Somehow I doubt I will get Xfinity to chat with Food Network on my behalf...  So I just pose the question to see if I am alone in this or if others have the same experience.

I highly doubt it's the FireStick, but I probably can't rule anything out...

Thanks!