Sorry to hear that. I wonder if they've changed the tubing ID size to make it smaller?
I've had mine for probably 6 months, no issues like that once I broke them loose when they came out of the boxes.
You could try replacing the tubing, or even another bottle if it becomes too annoying. I picked up a few of the offical replacement bottles, but it looks like a standard Coil Mater or the like will fit fine.
I'll bet you even tubing with a reasonable large ID will work. I thought my Recurve mod was going to leak. The bottle is similar in that it a good portion of the tubing just slides on, but it's pretty loose. Thought for sure it would leak, but it doesn't. And the bottle comes right out.
With the Luna, you have a very long pin to slide the tubing on. I'll bet going with a larger ID tubing it will slide on (and not leak) like the Recurve mod.