I own several Raspberry Pi’s. One of them is taking time lapse photos of a skyscraper going up two blocks away from my office. It had trouble uploading the photos every morning around 7am. It tended to catch back up at night. The problem went away once I replaced my 2amp power supply with a 2.5amp model. Day photos produce larger image files than night photos. My theory is the Raspberry pi had trouble processing and uploading the larger image files while running under voltage.