the top radiator hose gets hard and pops off

What is your question?

after driving for 20-40 mins the top radiator hose pops off. the coolant seems to stop circulating, not sure, but the hose gets hard. 2002 Jaguar x-type 2.5

What makes this problem better or worse?

it gets worse as the engine gets hot

How long has your 2002 Jaguar X-Type had this problem?

a few months but i dont drive it any more. its been sitting