Replying to SPK's?

Well story goes like this. I got my SPKs this season. Around halfway through the ski season the string for the liner had its top coating of string come off. They were still useable so I just said ok whatever. The today, on my other boot, the string absolutely snapped in half up near the tab to tighten the liner. I tied them and am still using them but im wondering if this has happened to any other NSers. I also would like to know if they are still under warranty if i got them around i'd say december 10-12.