This seems to be specific to 9.1.5067 (we skipped 9.1.4234) I’ve noticed it when changing access points at home on WiFi or when the device picks up a new DHCP lease. The other thing I’ve noticed is my device at home doesn’t seem to honor the DHCP lease time I have set to 24 hours. It seems to pickup an address whenever it likes. We have thousands of devices throughout our firm both internal and at home but no complaints or calls about it in particular. I’m hopeful something will address it in the next release.