If you have your H250s in docking stations and if they restart, you might want to check if you're using the correct AC adapter. As far as I can remember you have to use the 100W AC adapter when you're using the docking station, and an 80W AC adapter when you're not using the docking station.
Also I think that H250 had some issues with overheating and as we all know that can also lead to restarts. You might want to check your installed BIOS version and update it if it's not the latest
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