If you ever encounter a flapping fail-over cluster you might end up with one or more quarantined cluster nodes.
Quarantined nodes are drained from their roles and are not allowed to rejoin the cluster for a set amount.
You can find out the duration and threshold using this command:
In practise though, you might find your fail-over cluster with quarantined nodes outside of these boundaries.
You can use the following Powershell script to find quarantined nodes and rejoin them.