Actually, if you humor me one more time, there's one thing we didn't try. Based on the fact that you stated this same setup used to work for you with an older version of Isadora, we should try that.
Can you:
In Isadora, go to Help > Open Plugins Folder > TroikaTronix Actors PluginsSelect everything in that folder, then right-click one of them and select "Compress"You'll get a .zip file that you can later unzip and use to restore the contents of this folder later if need beDelete everything except the zip from that folderQuit IsadoraInstall an older version of Isadora using our Legacy Downloads Page (I'd suggest starting with 4.1.1 and working backwards)If you want to keep the recent version of Isadora on your computer too, see this article on how to install multiple versions of Isadora on your computerTry streaming data from Rokoko again with each older version of Isadora and see if any of them are stable with your v2 suit.One other idea, that unfortunately requires different hardware, is seeing if a Windows computer running Rokoko Studio and Isadora is stable for you. I know this worked for an artist I collaborate with in the UK who uses a v2 suit.