Flickering issue with Sofirn SP32A V2.0

Recently I purchased an SP32A V2.0 on Sofirn’s (somewhat) new store on eBay, since I hadn’t yet bought a ramping light and had heard good things about this one.

Unfortunately, I noticed that the light sometimes flickers (in both ramping and stepped mode), and it’s pretty annoying.
It’s escalated to the point where the light basically randomly ramps by itself, which is fun to watch, but makes it hard to use as a flashlight.

I did try cleaning the head/tail contacts with rubbing alcohol, but this didn’t have any apparent effect.
I’ve also contacted them over eBay about this, but in the event that there isn’t a way they can accommodate me, has anyone faced/fixed this issue before?

Here’s a short video of how the issue manifests itself: