Just once for me, as well. I had it exchanged at a B&M MSS just yesterday, in fact. I purchased mine online in mid-March. I wear it daily (of course except when it's charging), run 2-3 times per week, gently wipe it with a damp cloth after each workout, and it has held up pretty well until this past month. I started having problems getting it to charge and would have to fiddle with it to make sure that it continued to charge. Many times it would stop charging after 30 secs. Around the same time, it consistently shut off about a minute after I pulled off the charger. I cleaned the contacts with isopropyl alcohol, as suggested by MS and that seemed to slightly improve the issues. However, yesterday, after a run and the habitual gentle cleaning, the material on one of the battery covers completely came off, exactly like sinime's uncanny, but highly accurate, description. To top it off, after already being dissapointed by the peeling, it decided not to only shut down once after unplugging the charger, but continued to shut off by itself for about the next 3.5 hours. Luckily there is a B&M MSS relatively close to where I work, so I dropped in during lunch and swapped it out.