Rafael Benitez was appointed as interim boss in November until the end of this season, while neither of his predecessors, Roberto Di Matteo nor Andre Villas-Boas, managed a full campaign.
Lampard believes the uncertainty could become a problem for a club who have had 10 men in the hot seat in 13 years.
"Whatever the situation, it would be nice if a manager could come in and have a good crack at some consistency and stay in the job," Lampard said.
"We all understand we've had some interim managers and the fans and the club would probably be happier if we could get a manager who could stay for more than half a season, or for some period of time."
Meanwhile, Lampard reckons the race for the Champions League qualifying spots will go to the wire this season.
"We would be in a good position, to be sure, if we win it but it is a tough game this weekend. Then we have Manchester United away, Tottenham at home, Villa away and Everton at home," he added.
"It is a hard run-in so I don't think we will say we have a stranglehold on it until we actually have it. It could go down to the last game of the season."