Sound turning on by itself, v2 cameras turning off by themselves

Three brand new cameras started failing after one week. One turns itself off and will not restart. Errors 100200 and 90. Other two turn themselves off, can be restarted, but change settings including turning ON sound even though it was set to sound OFF. These two now will not allow sound to be turned OFF. Camera/software that turns on sound by itself is a major security and privacy problem and will require us to return cameras for refund.