TBH even the 3 has some serious stumbles when it comes to the audio.
The card takes like FOREVER to initialise,
(longer than twice the maximum cache length time just to be extra awkward to program for) : )
There are pops and sniffles even then when it plays.
I haven't really dug around in the audio on the DXG that much (I wasn't holding out much hope after hearing the 3) - It could be something as simple as a poorly written/managed/implemented driver/service/conduit/something of course. Or perhaps it really is a big ask to do the RT audio with the rest of the junk hanging around.
Either way, the fact that even the 3 has oopsies should put the DX(G)'s performance in context.