I replaced my Linksys router with an Apple Airport Extreme router and the signal drop outs went away. I am steaming at 100mbps using an Ethernet wired line and have no problems streaming.
I suspect the problem is not your Bluesound Node 2 or Tidal service. I recommend you review your internal network including your router. If you find nothing, I suggest you replace your existing router with a different router to see what happens. Your router should be able to handle high speed traffic. Other traffic on your network could cause signal drop outs but my guess is this is not the case. I suggest a different brand router than what you already have. Please keep us posted.