I made a board with a mega328, GPS Module, a few LED's and SD Card on it and I notice that when the battery still has plenty of power (3.9V (LiPo) with the mega328 operating at 3.3V internal 8 MHZ clock source) it will enter what I think is a brown out reset loop. I think the culprit may be the fact that the entire board is routed with 8mil traces. I have .1uF capacitors next to each Vcc pin and 2 10uF capacitors at the output of the buck/boost converter. I don't have an oscilloscope so I can't really see what is happening. Based on experience, would 8mil traces likely be the culprit?