This is interesring. I agree with
@GBA rocks . If you read the brick report all reported were users doing something that they have instructed not to do.
I'm a big proponent of CBHC. I like my 5 kids and wife being able to just turn on the Wii u and play (before I gave it to my brother). In terms of past system hacks i am very comfortable with the brick risks as they don't even come close to comparing the risks with an xbox360 or PS2 mod. I've restarted and used CBHC ever since it came out. I've even formatted my Wii U in order to test proper CBHC removal.
If the OP has indeed experienced the first brick without user error, then I'm concerned and would like to know more.
1. Did you follow a YouTube guide (never do this. Always come to gbatemp and ask)
2. In whatever guide you followed did you first boot to a CFW when installing CBHC?
3. Are you 100% certain that you removed all USB when installing CBHC?
4. What is the name of the eshop title that you bought and what are the VC injects titles that you installed? (If any). I'm talking about stuff you might have downloaded from mega etc.
I constantly recommend CBHC because it's the most hassle free way to set up your Wii U. If this is something that can now "randomly corrupt" then I'd like to know. For my own sake and for those I've recommended this method to.