St Johnstone's 16-year top-flight stay is at risk - what happened?

How have St Johnstone gone from Scotland's "most stable" to "most unstable" as they battle to escape relegation from the Scottish Premiership?

St Johnstone's 16-year top-flight stay is at risk - what happened?
How have St Johnstone gone from Scotland's "most stable" to "most unstable" as they battle to escape relegation from the Scottish Premiership?