Ctd00 dryer, keeps tripping the fuse but works for 30mins before. Any ideas?

Hello, I have a CTD00P dryer (Hotpoint). I works normally for 39 mins. Then it will trip the fuse. If i then wait 1hr, it will work again? I replaced the heater element and it worked for 2 weeks without fail. Now, it will trip the fuse intermittently, sometimes working for 1 hr, sometimes for 3 hrs?? Not sure what could be cousing this. Would be greatful for any ideas..