Anyone had PS failure due to their fluid boiling? Reason I ask is I've noticed my fluid bubbling after some heavy laps. Now this hasn't caused any real issues other than fluid weeping from the top of the pot but the sweat band I've wrapped around has soaked that up. It's so little and rarely needs topping up. I can't help but think that bubbling fluid is not really ideal and prevention's better than cure so I'm thinking a PS cooler will sort this. Is this a good idea or am I worrying unnecessarily?