@LukaszM Thanks for your input. I have heard of the shielding issue, but the problem happened whether I had anything connected to the USB ports or not. In any case, this all went away with version...

@m1hn3a and @Kevin_Z I can confirm that Connection Alerts in Tether are unavailable. And yes, it would be an excellent idea to be able to choose the SpeedTest server.

@Kevin_Z As per your request... My modem was replaced with an Arris TG3442S and now the time is syncing perfectly. I can also connect my range extenders in OneMesh and log in with my TP-Link ID...

@Kevin_Z The problem with the time being completely out of sync and not being able to log on my range extenders using my TP_Link ID is driving me nuts. I'm having my modem (a Technicolor CGA4233)...

@Kevin_Z In addition to the time being completely lost, I am unable to add any range extender in OneMesh with my TP Link ID. I always get a "connection time out" message.

@Kevin_Z Just an update. Unfortunately, the time has again lost itself. I reset the router today and still get the date as 17 May.