If you're pedalling but the dials aren't moving, you've most likely lost the Bluetooth connection to your bike or heart rate monitor. You can fix this without leaving the class.
Quick fix — reconnect from the in-class menu
Tap the menu icon (top right) on your Rider Dials.
Tap Bluetooth Connections.
Check that both your bike and HR (heart rate) monitor are listed as connected.
If either one is not connected, tap it to reconnect.
Return to the Rider Dials — your values should start updating again.
Common reasons the connection drops
Bike battery / generator low — pedal briefly to wake it up.
Phone moved out of Bluetooth range — keep your phone on the bike's phone tray rather than off the bike.
HR strap contacts dry — moisten the strap pads.
Another phone paired to the same bike or HR monitor — only one phone can connect at a time.
Phone Bluetooth glitch — turn Bluetooth off and on again in your phone Settings.
Why the dials look frozen rather than blank
The Rider Dials don't grey out — they keep showing the last reading when a signal drops. So if you suddenly stop seeing your effort change, the Bluetooth connection is the first thing to check.
Still not updating?
Finish the class — everything you ride from the moment the connection is restored still records, and it's not worth stopping mid-session to troubleshoot. Afterwards, ask in the chat and include:
Your bike make and model.
Your phone model and OS version.
Whether it was the bike, the heart rate monitor, or both that stopped.
Your studio name and roughly when the class was.