I was having similar problems as well. I sent them some emails about it, but they kept asking for more pictures and I just got frustrated with the process. It doesn't happen all of the time and I'm not really doing anything crazy with the watch, so I've just been kind of dealing with it.
sorry to hear that - if you would like to get a replacement, email sarah @ getpebble.com and she'll sort it out.
my RMA process was similar - a barrage of tests + pictures with a week or two for every response (or lack there of). Luckily, after a month of this i got the replacement, but terribly frustrating nonetheless.