I'm experiencing a similar problem. What version of minepeon and cgminer are you using?
I'm using what HF shipped me:
- MinePeon Version: MinePeon 0.2.4.3
- Miner Version: cgminer3.9.0h2
Once I find some free time I will try a different USB cable, upgrading to 3.11 and reflashing the SD card to see if any of these options help.
It's more likely an issue with the Raspberry PI's USB port. I had similar issues with running 49 block erupters on a powered hub. You can setup a cron job to restart your PI every few hours. If possible, run your Baby Jet off of a normal computer for a few days. That way you could confirm whether or not the RPI is the problem. Good luck.