Well, if it's a plugin - you need to figure out which one
It's going to be a slow job, but try disabling them one at a time, rendering (just the start I guess) Once you've found the culprit you should / might be able to make a minimal example - one track showing the problem and raise the issue with the plugin folks.
It's also worth checking the performance meter to see if there's somekind of bandwidth issue?
If you've got tracks (or busses) with a lot going on plugin-wise, consider freezing them before you do a final render.
If fact, if you can isolate the problem to a particular track or group, as long as it doesn't glitch when freezing, that might be a quick workaround.
If you have fx on the master, consider putting them somewhere else.