Our Model S Wifi connection has lately been causing our internet to slow to the point of unusability, and the problem seems to be getting worse.
For months, I have been experiencing an issue with our internet connection sometime slowing to the degree that it is unusable. We finally made the association that it seemed to occur minutes after I arrived home in the Model S, presumably when the car connects to our wifi. To address the issue, I would reboot our DSL modem, and the issue cleared.
Our wifi router (different than our DSL modem) provides some visibility into local traffic, including its wifi connection. When the apparent congestion occurs, the router traffic viewer indicates a lot of incoming wifi traffic. When I disabled wifi in the car, the wifi data from the car stopped, the congestion stopped and "normal" internet access returned. However, a minute or two after disabling wifi in the car, it RE-ENABLED ITSELF, the incoming wifi traffic resumed from the car, and the congestion and associated lack of internet access again occurred.
Thinking that the car was uploading autopilot telemetry to Tesla, I called Technical Support (who returned my call minutes later) for insight. (I have never had the major issues contacting technical support that seem to often be reported here.) TS said that autopilot telemetry is uploaded via the cellular network and not via wifi. He accessed our vehicle and said that it was up-to-date and could not see it doing anything unusual. He did say, however, that there used to be a way to disable wifi autoconnect that was no longer implemented. So, unless I tell the car to permanently forget the wifi connection, there is no way to conveniently prevent the car from accessing our wifi connection.
The router statistics indicated that the data originating from the car was in excess of our provisioned internet uplink rate, which is probably the root of the problem. Tesla TS suggested that I try to limit the device connection rate at the provider's end by using our provider's online tools. However, there is no immediate solution other than again rebooting our DSL modem which evidently somehow breaks the particular session in a way that the car understands. But, I don't want to have to reboot our modem every time I return home.
Based on my current understanding of the issue, and assuming that the car is generating legitimate data to wifi, I wish that Tesla would do one of the following:
1) Provide a way to limit the wifi upload rate so that it did not overflow my internet upload, or
2) Provide a way to turn off wifi without forgetting the connection entirely, or
3) Figure out and address what is going on that would cause so much upload activity