I just got a response from Peloton... here their suggestions: (I haven’t tried yet, I’ll do it as soon as I got back home)
Thank you for contacting Peloton!
In order to reconnect your Apple Watch to your Bike+, you will need to first restart your Apple Watch and then perform a factory reset on your Bike+.
To factory reset your touchscreen, please follow the steps below:
1. Tap the time on the top right of your touchscreen and select “Settings” from the dropdown menu.
2. From this screen you will need to select "System"
3. Select “Factory Data Reset” and then “Reset Tablet.”
4. Confirm the selection by selecting “Erase Everything.”
Once completed, you will have to sign back into your network and download the most recent update again.
Please let us know if this resolved the issue, we look forward to hearing from you!