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Perhaps best conducted by a third party if you want more honest answers. Generally people do not like confrontation and do not want to tell you what your faults are, if that is one of the reasons they left you. It could be innocent enough and not reflect on your service.
I don't think there is anything wrong with contacting a past client to ask why the change? Don't assume something went wrong. I would not send a written letter/survey, they're not committed to you anymore and won't take the time to fill it out. Besides, you'll learn much more by listening to how the person tells you what they say rather then the words they use, particularly if on a sheet of paper. They'll also tell you more.
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