If you are recording high quality video to the memory card on Nokia E5-00 device, to ensure the best performance you should use high capacity microSD (or microSDHC) cards from known manufacturers. If your recording to the memory card lags for seconds, replace the memory card with the microSDHC card, which class is 4 (4MB/s = 32Mbit/s) or higher. Note! The class means the data reading and writing speed.