Not sure what is causing it, but there have been many instances of 'plcd' crashing over the last few days. At the moment it does not seem to cause a core file unfortunatly. I will research "atcrash" and try to determine the cause of the issue. I have a sneaking suspicion there is some power line traffic from some I2CS device that is confusing PLMProtocol. If that is the case, it should be relatively easy to debug and fix.