Thanks for assistance. Solved.
It was some network problem, had some problem with the switchboard.
Fixed, back in business and running on an average of 47-49 degrees max. Need more cooling, trying to keep it 40 degrees max.

However, still having problem with 2 units where it started up running for about 2 hours then it just went off the radar.
Restarted a few times and still nowhere to be found. Still trying to resolve this.

My 20 miners are NOT STARTING!
It was running between 50+ to 60+ degrees, hence I decided to stop it and re-position the entire rack placement and put in extra air-conditioning to the room which took me about a week plus.
Now when its all good and I try to restart my miners, it would not start at all.

Powered it on, as usual the cold-start sound for less than a minute then it turned silent.
But it did not turn up on the designated IP address.

Tried restarted it couple of times, still the same.
Noticed both Green and Orange LED lights was up, tried to look for answers online(nothing much).

Tried factory reset, paperclip hold down reset button till it flash a couple of times and release.
It tried to restart by itself but just a very short "cold-start" sound for a couple of seconds. (Red LED light was up at the same time).
Then it went dead again and nowhere to be found, neither the designated IP address or the default 192.168.1.99.