Not sure there's going to be many takers on doing static analysis of your code.
Expect you'll need to debug yourself. Suggest adding instrumentation so you can understand the system state and paths leading to the failure. Refine that understanding with more instrumentation and sanity checking, and dig into the system with a debugger.
Most likely to be missing interrupt, or failing to clear status on something. Identify while() loops it may go to die. Report on radio, uart, and related status periodically, so you can see if the system is alive, and what flags up during failure.
