After some struggling I was able to boot your 4.4.0-23-generic #40~bpo1 and it appears to function at least as well as 4.6.0 rc7 did with regards to the freezing.
After some struggling I was able to boot your 4.4.0-23-generic #40~bpo1 and it appears to function at least as well as 4.6.0 rc7 did with regards to the freezing.