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I have the same exact problem. I have noticed that the devices become unresponsive from the moment that the "auto LAN" mode enables and the sign on the right of the name of the device changes to "auto LAN". When in normal mode, devices work fine, also they work fine on LTE connection. I downgraded to 3.5.8 and everything went back to normal as it was. Why is this happening?
Bogdan Boki