Does Extreme controller have garbage collection? What's best way to restore function?

Does the Extreme USB 3.0 have garbage collection in its controller? If so, does it operate as long as it’s powered-on or does it require a shove (and what would that be)?

When an Extreme USB 3.0 starts to act up – for example, slow read-writes or freezing during operation – what is the best cure: DBAN single-pass wipe, full format, fill with data and erase, or something else?