Samsung Series 9 Slow Boot After Crash

I have a Samsung NP9000 model NP900X4C-A05AU. It regularly crashes due to full memory. It has 8G of RAM, running Windows 8.1. It's done this since day 1 - I managed to remove some Samsung bloatware that mitigated the problem somewhat, i.e. from once a day to three times a week. Mostly, just before it happens I get the "close some programs or lose some data" message, and I can possibly kill something (chrome usually) to free some memory so I can reboot cleanly. Usually at this point, the "Modified" section of the Task Manager Memory usage tab is quite big. Reboot and it's good for another couple of days.

Sometimes the "close some programs" message is too late... I get the message and almost immediately Windows crashes and reboots. Up until last week, this didn't cause any issues after the reboot. But last week, it did this, gave me the message and immediately crashed. It took about 1 hour for it to reboot, sitting at the "please wait" dots. I was in the process of making a recovery USB to boot from when it finally came to life. Everything seemed ok, was able to start things up, and carried on as usual. Couple of days later, get the "close some programs" message, and am able to reboot. But the laptop takes 5 to 10 minutes to reboot. Up until I had this issue, a reboot would take 5 to 10 seconds (to get to the login prompt). Even a reboot after just rebooting takes 5 to 10 minutes. I've run scans on my SSD, it says everything is ok. Every reboot now takes 5 to 10 minutes.