It would probably be prudent to check the bit rate of your recordings and then test what kind of bandwidth your working with between your NAS and player to see if you have a network speed issue to begin with. Where I live most broadcasts are less than 10mb/s which is not a lot. Also note that it isn’t uncommon for powerline and coax network adapters to benefit (sometimes massively) from being rebooted periodically. Perhaps an investment in a wireless bridge may also be something to look into if you live in a home where the wiring doesn’t allow the type of adapter your using to work well.