4k stuck streaming

I have tried auto or legacy on a wired lan with 300 Mbps line still stuck every few minutes buffering. What setting am I missing

A bit more background would help.

What device?
What OS?
What version number of Infuse?
Is 300Mbps what you get in the speed test in Infuse or a network speed test.
Is this happening with all 4K videos?
Are you getting buffering with the circle icon or just a freeze?
Did you try SMB 2 or just Auto and Legacy?
Were you talking about changing the Streaming cache to Legacy and auto? If not have you tried that?

What are you streaming from? NAS, computer, router with disk, cloud?