I put my system to sleep every day but lately, when I resume/open my laptop lid. It starts the windows again and it is a boot all over again.Upon search logs on @Dave way, I found out a critical Kernal-Power which says
The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
I did google but the scenario provided here don't fit me, as I had put my system to sleep.
I looked in yesterday event, when I put my system to sleep and error says
The previous system shutdown at xx:xx:xx on 22/06/2017 was unexpected.
This is the time, I put my system to sleep.
How can I find which app/service is crashing so I can rectify the problem
Edit: It is worth noting here when it starts the next time, it is really sluggish for good 15-30 minute e.g. I cannot do anything until then.