There is no reason to block the kernel update.
One good think in the Free and Open Source Software is that provide often updates than other close software.
Sabayon does not install newest kernel
automatic (via rigo)like in other package software.If you want(to install newest kernel) you must to do manually.
So forget the reason that after form update your computers got the newest kernel and something bad was happening.
The problem is somewhere else.But i am not able to understand.
If you want to get more help you have to tell us specific things.
In general try to write exactly what is your problem and which is the last think that you did and describe a little bit the technical situation.
My other new computer tells me after the reboot that the new rootdisk (something like that) couldn't be found. The help i get there is not any help for a beginner.
I guess that you have confused the partition between Windows and Sabayon and something wrong was happening,including and the grub.
Yoy can get help also from the official wiki.
https://wiki.sabayon.org/index.php?title=Main_Page