H E L P !! Network issues with Teac NT 505?

I have a Teac NT-505. It sounds very good when I can get it to work. The problem as I see it is too many handshakes have to be made by too many pieces over the network. Both hardware & software are involved. FWIW I'm trying to get the music from a HD on my  my computer in the office to the Teac in the LR

My library resides on a Hard drive of a computer which is in my office. I run Serviio as the server. I use BubbleUpNP on my tablet to control the system. I have a Linksys WRT 1900 acs router which is/was among their best. Though I have used computers for 30 yrs and stereos since I was a kid, I am not the best at troubleshooting network issues which is where I believe the problems take place due to too many handshakes necessary  between too much hardware and software. I am hoping to resolve the issue by direct connection of a HD of some description which will take the library off of the network. But I haven't tried that yet, mostly because I'm old and tired of dealing with issue after issue. Then too, even after I do that , IMO, there is no guarantee that will work and I am tired of experimenting with it. I bought the streamer/player/Dac  with the thought that it would be easier. But its been very exasperating instead.

MY other choice is to try another streamer, IE an Aurender which has the proprietary  HD and software. But then I will need a Dac which adds more expense which strains the budget of an old retired guy. I could use the Dac of the Teac but was hoping to sell it to help fund the Aurender, etc
Am I on the right track?