Greeting All.
Just to let you all know, I have flashed my ATIV S back to WP GDR3 using instructions from this forum and this time I changed the CSC code to NEE. As I read this version will get WP 8.1.1 update quicker and there was no option to set to ATO.
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After installing WP 8 GDR3, I got the upgrade notification for WP 8.1.1, but this time I noticed it was the Samung official notification with official firmware. Previously I noticed it mentioned only Microsoft update.
So I just went ahead and installed the WP8.1.1 update.
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After update is completed I am on latest firmware and WP 8.1.1. Also my firmware is now the same version as those reported by other users 2424.14.9.4.
So I think my previous problem was caused by my firmware version
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My phone has been running normally for the last two day now, initially I have performed several soft reboot to ensure it does not have previous problem.
Thanks all for all your help and support. I will keep you updated on any further problems.