Was just wondering if anyone else who purchased this "multi-tool" had any issues with their blade? I've had mine for roughly a week and it seems like the blade doesn't hold an edge well at all. Cutting a small cardboard box from Amazon took a very small chip out of it which I was able to correct on my Sharp Maker. I know it's a tiny blade, but I guess I was expecting more seeing as it's D2? Maybe a bad heat treatment on this particular one?