It seems this error comes from CentOS, RedHat Linux and Fedora.
Did you install QB on one of these distributions ?
There is a "sanity check" to know if your curl is compilated with (outdated) NSS (instead of OpenSSL) :
curl -q --cipher RC4-SHA -s --include https://connection.s3.amazonaws.com/test
I tried on my server, the test passed without issue.
I also seach on QB lab, nowhere Curl is complilatd with specific version of NSS or OpenSSL.
It installed by apt-get so I guess it's linked by default with the latest OpenSSL version.
You can check if curl has been compiled with OpenSSL or NSS with this command :
I can see GnuTLS which is another library to use SSL.
Anymay, you can test your disk with Bench and
dd if=/dev/zero of=test.data bs=1M count=1000 conv=fdatasync;rm test.data