4) Change in strategy
You may welcome change, but don't be too enthusiastic if it does not mesh with your investment objectives.
A fund could change its investment mandate and you may not subscribe to the new one. Believe it or not, some funds do morph into a different product over time. A change in fund management could result in a different flavour. A fund that initially tilted towards large caps may now be a more mid-cap oriented offering. This may not suit your risk profile.
Or, a fund may legally change its investment objective. It could also be a case of your scheme merging with another. N0t to mention, the assets of your fund house being taken over by another asset management company, or AMC.
All these could call for you offloading that specific investment.