All my tasks suddenly deleted?

See the [other thread}(Personal space name broken? - #5 by kellertuer) yes I did. Actually deleting the list of tasks and setting it up again is a solution to this, but I would prefer to know how often I have then to reset my lists? I am using this to store my knowledge – if I have to re-setup everything ever so often, I can also return to physical papers.

That’s why I would like to understand how this happened more closely.