Sometimes get Latency in Logic

Hello all.

I am currently using an AudioBox with 2 inputs. It is plugged into my Late 2013 iMac 27".

In Logic, I use Amplitube (IK Multimedia) as a plugin for the electric guitar sounds.

When I use the iMac's speakers as the output, I often get tons of latency. When I unplug the USB cable and re-plug it back in, it works. A year ago, I never had that issue.

However, when I use the AudioBox as the output device and use headphones, there is no latency.


Oddly enough, in Garageband, I never have latency issues when using the System Default as the output.

Is there any way around this? When I'm just coming up with song ideas, I don't want to be stuck with headphones. I have not touched any settings so I have no idea why it has started to do this.

The AudioBox has fallen off of my desk a couple of times so could it have to do with that? Even though the issue is only in Logic so far?

Thank you