Is unlocking Mac with Apple watch flaky for you?

After working for a while, unlocking my Mac with Apple watch stopped working. I was able to get it working again by spending a bunch of time fiddling with settings and rebooting everything again. Not sure what exactly worked. But then a few days later it stopped working again and hasn't worked even after updating all software and doing the reboots. I'm not going to bother trying to get it working again unless there is some known way of fixing this issue. Is anyone else experiencing problems getting this feature to work consistently?