Could you let us know the exact brand and model of device it is ? It looks like you don't have enough CPU power or free RAM. I do have by time to time a small latency as well with my Eonon D5150Z while using Igo NextGen, but it don't do that really often and i have a small latency, not that much. Your problem could also come from a slow SD card, check the bandwidth it have and try a faster one to see if it makes a difference.
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