Problem of bufferingbATV 4k

Just bought a brand new ATV and infuse pro. However I cannot stream 4K movies from my computer every 20 seconds the streaming stops trying to load, then it continues another 20 seconds… so on so forth
Is there a way to increase the buffer?

we need more information to give you any advice.
Specs on PC serving files
is this Wireless\Wired?if wireless, A\G\B\N? how far is your ATV4K from your PC?
What protocol are you sharing you files with?
are these 4K rips you made yourself? is this all rips? just some rips?
whats the bitrate of these files? can you post the mediainfo of one that buffers a lot?
have you tried regular HD files?