I'm having to send mine back for replacement for the second time due to the bubbling on the charging plate. I'm having trouble charging it. On top of that, for the past month or so it powers itself off about a minute after I remove it from the charger every single day. If I don't remember to power it back on, I get no data, which makes it basically worthless.
This will be my second replacement (the first was for a faulty heart rate sensor). Sadly, I think I'm going to sell it when the replacement comes in. I'm sure the corrosion will happen again and it might be out of warranty the next time it effects the charging.
For what it's worth, I clean my Band every single day and gently wipe the contacts with a Q-tip moistened with alcohol a couple times a week. The metal must have some sort of reaction with some peoples' skin as I've seen this issue posted on here many times, but it doesn't seem to happen to everyone.