TY Bluetooth
This is an addendum to the following post:
TY bluetooth - Apple Community
My issue was similar and must be a smart light/plug thing. I have KMC smart plugs and one of them is on the edge of my WiFi reach and occasionally goes offline. I turned on Bluetooth based on KMC recommendations and if the plug is offline I can go near it and it'll come back online. What I never checked was if it was actually connected via Bluetooth to resolve the offline issue as I only cared it came back online. So today I see this TY thing connected to my phone and I find the thread above. This reminds me I may have a similar situation which I confirmed.
I turned off Bluetooth on my phone and then back on. Only my Garmin connected, I checked the plug in the app and it's offline, so I go near the plug and it comes back online. So I again check my Bluetooth connections and the TY is back.
Thought this might be helpful for anyone wondering what the TY connection is.