Michael Appleton is the third manager to leave Championship Blackburn Rovers this season, following the departures of Steve Kean in September and Henning Berg in December, reports BBC Sport.
"The owners probably made the first mistake when they sacked their executive chairman John Williams and their managing director Tom Finn and since then they've gone downhill," said League Managers Association chief executive Richard Bevan over the situation at Blackburn.
"Everything in business is about communication. Michael told me he had no conversation at all during his tenure since January with the Indian representative running the club.
"He's got 20 players on the injury bench. What he needed was support, not a letter of sacking.
"Blackburn need to look very hard into stability, they need to look at communication with the fans and they need to look very hard into how they can invest in personnel, look medium term. That's the only way they're going to climb up the table."
Bevan added that the Football Association "needs to work harder" over the issue of managerial instability.
He said: "We need to work as a group - the Premier League, the Football League, the Professional Footballers' Association, the League Managers' Association - to ensure that we have better training not only for managers but also an understanding of how you run a football club."