Internet speed has nothing to do with the audio track being out of sync. If internet speed is too slow, you can get pausing and freezing, but it doesn't affect audio sync. Simply exiting and restarting the app doesn't always work. On a FireStick, many apps will continue to run in the background.
The 1st step should be to restart the device itself - this ensures that all apps are stopped, and cleanly restarted.
2nd step would be to clear the cache on the app, if the device offers that option. Most devices let apps cache a certain amount of data to enable them to launch in a preset state, and sometimes this data gets corrupted. On a FireStick, you need to go to app management.
3rd step is to adjust the audio delay for the app. This is an option on both FireStick and Roku.
As an FYI, I consistently ran into this issue on both Roku and Google TV devices. I switched to FireStick 4K Max and have not experienced the issue since.
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