Laptop will not wake from brief sleep, (hibernate set at 24 hrs by me)

[bawldiggle]

This morning I left my laptop on, after 2 hours it was in Sleep mode (as exspected)
No actions would wake the OS. Mouse move, space bar, any keyboard key, boot button.
The screen was black. I could hear the HDD running (normal sounds)

At night I have been 'Hiberanting" the OS manually for the last 4 days.
Lots of brower windows plus tabs on each brower instance.
12+ TXT files open on an external USB HDD (my data-drive)

After some desparate key-poking I did an emergency shutdown (by holding the boot button down)
- and scrifice any open TXT files.
After shutdown, waited approx 2 mins -> cold booted -> no problems.
I have rebooted (cold) several times and no problems

My laptop is always on mains power.
Power setting "Balanced" set at 30 minutes to sleep
Hybrid Sleep is OFF
Hibernate after : 1440 minutes (24 hrs)
Allow wake timers : Disabled
C:\ drive ... 204 GB free of 249 GB
External data drive (data partition) ... 33 GB free of 50 GB

Did a search of PM-forum for "Black Screen" ... but not a lot of results with solutions
One thing is the

Would appreciate some help on what might be the/a problem, thank you

Wasn't sure if this thread should be in BSOD ... I am not getting BSOD

------------
Lenovo ES540 . . . purchased Aug-2015 but not used until Jun-2017
Win-7 PRO x64
OS was cleaned installed at a PC shop about 12 months ago.
- since then graphics have been very slow
- when a lot of files are open creates multiple shadows of dragged windows
- I mostly use Metapad360 (TXT files) and browser (Palemoon)

 

[Megahertz07]

After the emergency shutdown (by holding the boot button down), did you let check disk to run?
Why was OS cleaned installed at a PC shop? Why didn't you do a Factory recover?
- Schedule a disk check (chkdsk c: /f). Reboot
- Do a system file check. On a CMD window type sfc /scannow