Dropouts when bouncing in Logic X

Have you tried quitting Logic and restarting your Mac? No? Then do that. Wait for 5 minutes after the desktop has appeared (all kind of background tasks run in those first five minutes or so), then reopen your project. Chances are, the issues have cleared up. If not, then try to freeze the tracks that give problems - if they sound fine "frozen", then the bounce will be OK too.

The audio interface has no impact on the bounce. It is all processed inside the computer. This is just numbers after all.

The audio interface does make a difference when recording and listening (The analog/digital conversion).

Does the problem you describe, happen in both Bounce in real time and offline?

OK. Maybe hardware or software related with your interface. The interface needs a driver? You may look for an update at the manufacturer.

You said you just updated Logic. Is the problem was there before?

Let us know of the results including the details of the interface. This may help other users.

Good luck.

One super nasty gotcha I had after major upgrades and dropouts, is the license keys of 3rd party plugins.

Sometimes with big upgrades of Logic or MacOSX, at least with Ozone, Flux and Slate plugins, I see trouble validating the license key in the upgraded situation and then go into demo mode, which often has built-in annoyances like random dropouts. If so, click the suspected plugins, it will say "demo mode!" or something.

Re-enter the license key (which of course you kept somewhere where you can find it back :-) ). A similar problem can be that the iLok key can't be detected (if you have one), I once solved it by shutdown + startup. Normal restart was not enough. which indicates crappy hardware drivers.

It is super gross because you might not notice until months later, most people don't use each plugin on each production, and Logic's after-upgrade plugin self-check procedure does not check for license problems.