Cranbrook: why the high turnover of councillors?

From the Cranbrook Town Council website, a comment:

Should we be worried about the high turnover rate of [Cranbrook] Town Councillors?

The turn over rate coupled with the extremely short period spent as a Councillor, by some, seems to point to some form of real and deep seated problem within the Council.

Generally working out what, or who, the problem is,is not difficult, resolving the problem however can be more difficult, but resolved it must be if the Council is going to be effective.

Just a thought! However resolved it must be!