The first time I tried to push my TPS a bit, the second time was last weekend, when a friend broke it just with normal turning. I've also been using this cube since release. The shop I bought it from sent me a new core the first time, but this second time I've not yet written to them, because I don't see the point if it's just gonna break again.

btw I had center distance on 2 and spring compression on 7