Hello,
I have been with Doorhost for over 3 years. I have always have excellent and superb service by there staff. Performance of my website has always been super. I have had VERY little down time in the last 3 years. I have also had this problem with the tmp directory with Doorhost. I have submited a ticket and within a hour the problem was resolved. I would recommend you contact DoorHost if you still have problems. They are very quick at resolving any issue you are having.
Adam S.