I have some employees who will pick up any task that falls by the wayside, take on tasks or responsibilities that other people should be doing but aren't, and end up doing all the things no-one else volunteered for almost by default. The problem comes in when they then grumble about being too busy / having to work overtime / take work home / etc. etc.
It's clear to me that the behaviour is detrimental to the person's health and wellbeing (often they end up working unpaid overtime, bringing work home, etc.), and ultimately it harms the rest of the team/group/business as underlying issues are being covered up or not properly handled, rather than exposed & dealt with.
What strategies could I implement to reduce this behaviour so that neglect is not covered up, good employees are not burned out, and management is more aware of workplace difficulties?