jitter

Jitter results from timing errors both in recording and reproduction. Top studios therefore run superior clock sync. In reproduction clocking (Ocxo or rubidium) can make a major difference if the dac allows for it. This particularly applies if dac and server are linked via asynchronous USB. The assertion that modern dacs don‘t create jitter is non-sensical; stanalone quality master clocks alone cost in excess of $7K, those are not contained in $3-5K Dacs.

"Jitter is a non-issue solved decades ago! Present day DAC's and streamers are immune to jitter. No need for re-clocking devices, despite what the neurotically obsessed will claim."

*sigh*

Your ignorance is absolutely monumental, @jasonbourne71 

Anyway, back to the OP's question.....you can't fix/remove jitter if it is embedded in the original recording, but you can certainly minimize it during reproduction in your system by using quality equipment.

my new DAC exhibits dropout on a few HD tracks that my old DAC does not. The manufacturer of the new DAC says it is from excessive jitter being received from my streamer, and will adjust the buffer....I will see if this is correct when I try a new streamer next week....I also wonder if  the buffer is adjusted will this affect  the overall sound on  tracks that do not have dropout?

I presume the reason the oldDAC does not have dropout is a "better" buffer?

I suspect adjusting the DAC's buffer will fix your dropout problem, but I'm rather skeptical that the issue is "excessive jitter" from the streamer or recording.

I don’t think jitter causes dropouts. Are you using WiFi?  If you are, that’s more likely the issue I think.