Porter left the Doobies in 1980, citing frustration with the hectic and constant touring schedule.

Many cite frustration over being obliged to do the work of clerks, messengers, maids and orderlies, who are also in short supply at many hospitals.

Beyond ground zero, many firefighters cited lingering frustration over the "double zeros" - the contract in which the first two years, 1995 and 1996, brought no raises.

People who have left have cited frustration with management, less job excitement with the end of the cold war and opportunities to make more money in private life.

He declined to seek reelection in 1840, citing frustration with the politics of the city.

Kucmierowski later departed music, citing frustration with fellow band members and the whole music scene.

He left his post at Rochdale in November 2005, citing frustration at the club's financial problems.

Mr. Gordon cited frustration over delays in hiring faculty members.

After the Dollar General 300, he left the team, citing increased frustration with the direction of the team.

However on 18 October 2011 he quit the job citing bad working conditions and frustration after several key players had been sold.