Wired Airport Express devices out of sync?

I have two Ethernet wired Airport Express devices - playing them through Roon, one of them consistently gets 1 - 2 seconds behind the other in playback. Any ideas?

Disregard - found an issue that caused one of the airport expresses to be wireless versus wired. No issues when wired. Tremendous issues when wireless even with great wifi. wound up ditching all airplay express devices for Allo Players… absolutely zero issues, even over wireless. - flawless,