Audio and video not synced

Hey :) . Any time i want a video on my phone including instagram facebook youtube and gallery the video pauses for a few seconds while the audio still plays. then when the video plays again the audio and video are out of sync. It doesnt matter if the video has fully loaded (youtube) or if i watch it a second time it pauses in the same place and problem still persists super annoying and iv read through other people with problems like this and there are no good answers. my phone also has super ****ty reception like everywhere and its annoying as hell especially when people on the same provider have a strong connection. thanks for any help. my one is a galaxy lte core prime

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