I have Chromecast plug-in setup to send voice announcements to number of devices (see the screenshot below).
It works as intended however the announcements are delayed significantly 20-30 sec. to one device only "Google Chromecast Audio" called "Music" in my setup. All other devices act promptly playing the voice message. I did power cycle the Chromecast device no luck. Furthermore, Chromecast plug-in keeps losing connection to some devices randomly and restores it, but if a message is supposed to play at the same time it is lost fully or partially.

Click image for larger version

Name:	Screenshot (114).png
Views:	13
Size:	114.3 KB
ID:	1252081