Didn't realize a second generation came out for these. I have 24 switches and only had trouble with 2 (technically 3) of the switches. The first one I think was user error when installing and not having a breaker off. Leviton sent me a replacement and that replacement has never worked right. Wouldn't upgrade firmware and has not been able to connect to network.
The other switch that failed stopped turning the lights off all together. No matter what you do to the switch it is always sending power to the fixture unless you flip the breaker or pull a wire. I have found the customer service pretty helpful in the past but I just haven't gotten around to contacting them about the latest issues. I will probably just buy a couple of 2nd gen replacements and then try to get warranty replacements later and use those in new locations.