Me 3...
I've been breaking with a Samsara tip for over a year and a half. And I've spent alot of time breaking with that tip. Personally it's my favorite break tip out there. I really like the consistency and the hit.
But i've had the layers come undone several times always the same way. I'll be breaking and suddenly notice a small crack running around the the tip at a layer. So i'll have it shaped down below the crack and it'll hold up for a while and again the same thing...
I've had the tip break off 3 times. Once the whole tip came off, twice it was at the layer where it was cracking.
Last time this happened i had the tip compressed and shaped down because i needed it right before a tournament. It's fine now and has held up recently pretty well. I hope this issue doesn't continue but im not sure what could be a contributing factor to the tips delamenating so consistently. My cue man, Ted Harris, has made a call to Samsara to report the issue. Maybe it would be a good idea for you to call them also... Who knows you may get some free tips.
Good luck and Break em good!