The crane might be perfectly fine. The operator might just be tired or stressed. You won't know for sure unless you refrain from all construction activity for 3-6 months. And that includes looking at pictures of construction sites.
Is it possible though, that the crane operator (due to their position up there looking over the city, and at many, many attractive construction sites) is thinking of other, perhaps (in their wandering mind at least) more exciting sites often, so then when it comes to erecting on their own site, the drive is not there?