Hey Patrick. Could you provide some more details of your setup? This thread is a guide: Guidelines for Seeking Support on the Forum
…and include everything from HRM model to the specs of the devices you’re running Zwift on, app versions, OS versions etc.
As a general rule, I’d start by doing manual checks for OS updates, then apps, and restarting all devices. Failing that, completely uninstall Zwift, unpair all sensors, start from scratch.