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I responded to Felix privately, but here are my comments, in case others have experienced the same issue--
Thank you for your response!
Again, RB is truly amazing on the iPhone-- wow.
I've just had success in isolating the issue - i'm sure the problem is with Safari, but you may be able to overcome it--
Sequence of events for crash 
- join a wifi network 
- go to my RB web address 
- press camera button 
- press Start Preview and enjoy video 
- do something else with your phone outside Safari 
- leave wifi source (or turn wifi off) 
- go back to Safari (this time on EDGE) 
- Safari tries to load the camera because the video was running last time Safari was up, but the source is not WiFi, it's EDGE 
- Safari will crash
Sequence of events for success 
- go to my RB web address 
- press camera button 
- press Start Preview and enjoy video 
- *** press Stop Preview ***   <------that is the key.  We must "stop preview" before leaving! 
- do something else with your phone outside Safari 
- leave wifi source (or turn wifi off) 
- go back to Safari (this time on EDGE) 
- press Start Preview and enjoy video, slower, of course, on EDGE.
Switching between data sources without stopping the video feed causes a Safari crash.  We must Stop Preview before doing anything else to prevent a crash if rejoining from a different data source.
Can you force your code to go back to a state where it requires you to "Start Preview" again after leaving Safari or each time when re-entering that page?
GREAT PRODUCT!