WSFC ROLES Keep switching from Primary Server to Secondary

Hi 

Wonder if someone can help, today or HA environment starting switching the roles over from the primary to the secondary causing us to have an outage as the servers stayed as they where. 

We are running SQL Server 2019 CU4.

Example

Node1 Primary

Node 2 Secondary

Role fails from Node 1 to Node 2 but the servers do not failover.

If anyone can help me to prevent this I would be grateful.

Thanks

Clive