Bosch 1200 express heater element damage

[Owen]

I recently replaced the heater element in my bosch exxcell 7 1200 express front load washing machine due to the machine tripping the fuse, when i removed the element i could see that a gouge had been taken out of it about 2-3cm from the seal. I put this down to age as we’ve had the machine for 4 years with no problems. I replaced the new element, making sure it was inside the retaining clip and after 3 washes it tripped the fuse and after i removed it again i can see the same has happened. When spinning the drum and looking through the gap for the element you can see a section more than the rest, could the drum be out of shape ? Any help would be much appreciated. 

[Whitegoodshelp (Andy)]

Damage to the heating element in one specific spot like that sounds like the drum itself is loose and hitting it during spin, potentially when heavy loads are in. Isn't it noisy on spin?