Since my upgrade to OC 9.1 I get kicked out of the system after a few minutes.
A message appears quickly "Failed to request page. Please try to reload manually." or similar. I gets short after replaced by "[...]. Reloading in 5 seconds."
The only line I can see in the error log around the time it happens is (changed client no. in URL)
opendir(/tmp): failed to open dir: Permission denied at /kunden/000_000/owncloud/lib/private/TempManager.php#188
Sometimes when trying to login again I also get the error msg
Access forbidden CSRF check failed
When I remove the "?redirect_url=" parameter and value I can login again after a reload.