Hey,
If it's a consistent delay it's most likely latency as a result of the hardware buffer size settings, or latency that's been introduced by a plugin.
I don't know Audition but most suits have a file/settings, file/preferences, device/settings....something like.
Look for buffer size or latency adjustment options. Ideally you'll want the buffer size to be 256 or less. If it was 512 or higher, that was most likely the problem.
It's not going to be related to the drives. If your software can't get audio from/to the drives quick enough, it'll just crap out and tell you.
Maybe less likely but it's also possible that you've been using hardware monitoring up until now and recently switched without knowing?
If your interface has that option, it'll be a physical knob on the front of it labelled software/direct, or something like that.
Software latency as described above won't be heard when using direct or hardware monitoring but, equally, you won't be able to preview any software effects that you've added, whilst in record mode.
Hope that's useful.