It is a problem that happens when you download an update to a RE, but the license doesn't get written to your ignition key or your authorized computer.
So, don't download an update if you have a gig, it's as simple as that. You will NEVER have to log on if you don't get any updates. And if you do have to download an update, watch the Authorizer window and make sure the "Writing Licenses" finishes completely.
I play shows on a weekly basis with my computer, so it's not a problem with everyone. I always open Reason before I disconnect from the internet after getting any new REs, to make sure it doesn't need any licenses to be written. You'll know because a dialog pops up saying "Licenses are not up to date" or something similar.