Hello jhoh,
I see no one has responded to this post yet. So, at this point I would recommend contacting your local Xerox Support Department to speak with a Product Specialist about losing wifi connectivity. Please call 1-800-821-2797 or 1-800-835-6100
Each time my 3215 loses power (gets unplugged, power lost due to storm at the home, etc), it forgets the wifi setup (SSID / password). Is there a battery or something to replace to ensure it maintains memory when power is lost? If so, how do I acquire one?