As part of my data acquisition system development, I diagnosed and resolved critical data transfer issues in a dual-microcontroller (Teensy) setup operating at 48 kHz sampling. I identified that incomplete data transmission was caused by USB serial communication bottlenecks when both boards attempted parallel data transfer. By isolating the issue through structured debugging and system-level analysis, I implemented a sequential data transfer strategy that significantly improved reliability and ensured complete data capture. This process strengthened my ability to troubleshoot complex hardware-software interactions, validate system performance, and apply efficient solutions in real-time embedded environments.