I have the Node 130 (the one after the 2i), and find the SQ superb with Qobuz and Tidal, with hi-res, well-recorded music (equivalent to LP quality). But the 130 may have significant improvements over the 1st and 2nd generation Nodes, which I haven't auditioned. I have three ideas for you:
1) use the Diagnostics function in the BluOS system Settings to check your Wi-fi signal strength, if you're not using a hardwired internet connection to the Node. It needs to rate "Excellent" to successfully stream hi-res, although I think a weak signal would be more likely to cause dropouts or buffering than impair fidelity.
2) Try using a USB cable from the Node to the DAC, if possible.
3) Be sure to compare apples with apples--e.g., the same album on the Node as the CD you're using, and try a few different albums, preferably ones that are well-recorded in the first place.