Intel Motherboards : on power on, shuts down, then restarts normally

Not every single time. 

I shut down from windows, then 10 seconds later i pressed the front power button to turn it on again. The PC turns on for a second, then off for a few seconds then turns back on normally and boots. 

Did not touch the PSU switch or turn AC power off.  

I will keep checking  over the next week and update. I keep trying and it's not happening every single time.