01:03
@JeremyW: Well, boot works fine.
@JeremyW: However, sleep cycle is still the blank thing.
@JeremyW: Sleep cycle problem seems to be caused by VirtualBox Bridged Networking option.
Because a second attempt worked.
I guess I should reinstall VirtualBox as well, because I kind of not used that for a long while and probably disabled some vital part of it from automatically running or something.
Probably the intermittent drops are gone too now.
In any case, will see how the next reboot / hours / sleep cycles evolve before drawing a conclusion too fast...
Install VB again --> Sleep Cycle broken.
Tick off again --> Sleep Cycle works.
Will look into NAT instead, or attempt Hyper-V.
In any case, the flawless boot and fixed sleep at least is very promising... :)