OK,
When you power up a computer, it looks for your Router (the SSID you said to use) and a negotiation goes on between your router and your computer (in this case your B2 or BB1) for an assignment of an IP address for your computer (it is the router which manages this!).
Thus if you power off your BB1 or B2, the next time it starts up it may be given a different IP no from last time. This is what is happening to you.
This matters because when you use your Web UI to access your BB1 or B2 it looks for it on the IP no that it last used. This is why your Web UI is not working (it cannot connect to your BB! or B2).
There are 3 ways to address this
1) set up your router to assign a FIXED IP no to your BB1 or B2 (this is done from within the software interface of your router) - this is what I do at my house,
2) use the Brennan App for iPhone and Android - this first search for the BB1 or B2 on your network then connects to it.
3) type the BB1 or B2"'s CURRENT IP no into your browser search bar so that you browser knows where to find the unit.
Hope this helps
Fred