What about Ownership? What about Permissions? What about your Server Type? CGI or DSO? What about disk space?
By adding that code to wp-config.php you are telling WordPress where to look for your tmp directory and where to upload and unpack files in that tmp directory. Personally I would not do this and would instead fix whatever problem is occurring on your Server. Didn’t your Host offer to help you?
Also there is another very rare problem that can cause this: database damage or corruption. You can try a database repair, but it has about 1% chance of fixing DB damage or corruption problems. What I would do next is install a test site on the same Server in a new folder and see if the same problem occurs. If it does then this is a Server problem. If it does not occur on the test site then it is either database damage or something else that you have installed on the other site is causing this problem or this is a disk space problem or this is an Ownership or Permissions problem.
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