SOLVED (Sort of): After updating to 2.1.9, I was getting a no response from hub message about 75% of the time I tried logging in from the cloud.
This soon went up to about 90% of the time and eventually 100%.
On recommendation for a user in the forum, I downgraded version 2.1.8 and was able to login every time.
What Iโm most disappointed about is I contacted support by email twice over a four-day span, and never received a response other than an automated email logging my request for assistance.
I really do like the Habitat hub, but am second guessing itโs long term viability with this lack of support.