We have had 3 echo dots running in the house for a couple months, flawlessly. Last week they all started reporting that they lost their connection. I've run through troubleshooting, resetting the network, making sure my 2 and 5 Ghz networks have different names, power cycling, making sure my cellular data was off when setting up, and even doing a factory reset and unregistering my devices, then starting anew. One thing I haven't figured out about the factory reset is that once I get the device up and running again, it has the same name it did before. That somehow sounds like I'm not getting all the way reset. At the same time, the wake word is reset to Alexa. I am at a loss to solve this problem. I would appreciate any suggestions. There is good wifi strength throughout the house.