you have to do xray to see that it has internal heating wire broke due to hidden factory defect. but since jbc says its consumables you can only try to get moneyback by court. too much efforts.
jbc have very thick heating wire inside, but 1) in original station there is transformer and 2) thick wires dont raise resistance when heated. so some tips have 2ohm res which results in 250-300 watt startup. this is very heavy thermal shock. original stations somehow limits power by using AC power, but its not as much as needed. i have custom built station and once accidentally started tip at 300 watt DC, which resulted in cracking sound and lost contact. actually it was caused by arc in tip holder. after that i limited PWM to 150 watt cold start.
also dont forget about plating . jbc has tips with "normal", thin(high thermal conduction) , and heavy duty coating. normal coating is like 0,15mm, which is twice thinner than hakko normal. thin have like 0,1mm coating or less. you should never ever use these tips with acidic flux.
so to ensure long life - dont use wet sponge, acidic flux, dont raise temp, high thermal conduction tips work similar to pure copper. and if u use custom built station - limit power usage.