That's really sad to hear. And as the GNex is not available officially in India, I can't get it replaced either.
BTW you said 'probably', what can be the other possibility?
Well I too have something to elaborate. Both the times (on ICS and JB), the problem occurred while activating Bluetooth from Notification Toggle (downloaded from Play Store). It's not that whenever I used Notification Toggle did the problem occur. Several times Bluetooth successfully got activated using Notification Toggle.
So as much as I feel that it could be a problem of Notification Toggle, I feel that the opposite is possible too.
Another thing is that I had downloaded a paid app for free from a torrent website. Tapatalk to be precise. Many of my friends suggested that and I wanted to try it out and so downloaded it from torrents. On both bootloop occasions, that 'pirated' copy of Tapatalk was present in my phone.
Now I have purchased Tapatalk, uninstalled that pirated copy, uninstalled Notification Toggle and now I just tried three Bluetooth transfers with my system (2 send and 1 receive) and they took place perfectly. Is it possible that the pirated copy of Tapatalk was causing the issue?
I know it's not ethical and even against the XDA rules to discuss about such pirated copies but I didn't want to hide anything when asking for a solution to my issue.