That's terrible, but I hope the BBinfinite works out.
I just replaced my Shimano BSA 68 threaded BB after three years because I falsely thought it was clicking slightly (It turned out my pedal spindle threads simply needed some grease). I saved the perfectly old one as a backup. Even though I can see superficial dirt in it, it feels smooth (and wasn't the source of the click). BB really should be set and forget.