A fire will burn too quickly if there is an excessive air supply. If you find that this is the case please check that the door is closed properly and that all vents and seals on the stove. Door seals on stoves do need to be replaced on stoves due to wear.
Leaving the vents fully open for long periods of time can also cause the fire to burn too quickly. Once the fire has been lit you need to keep an eye on the stove until the fire is established. Once it is established adjust the air controls accordingly.
Check to see that the baffle plate located internally at the top of the stove is positioned correctly and has not deformed.
Excessive chimney draw can also be a problem if you find that the fire burns too quickly.