SRAM chain rings

[Starvin' Marvin]

I couldn't figure out why I had to keep having my FD set virtually every week as it would rub rub against the FD cage when on small chain ring(39) and big ring(23). LBS kept telling me that SRAM derailluers are notorious for being fickle. So anyway while riding this am I looked at the big blade while pedalling and lo and behold I saw the ring was warped. So that explains why I kept having to set the FD all the time. Any other SRAM riders picking this up?