This is Probably the Manufacturing Defect.
In India, this is probably the most expensive router. I bought the router in month of September and it is July when I noticed the problem.
Basically, I opted for two positions in all four sides. I had one antenna as perpendicular and other as inclined at angle 60. So I am now with 4 broken antennas as attached which were placed at 60 degree.
The plastic ring is so light that it can't withstand the weight of the antenna - antenna itself is really heavy
Broken Antenna which were at 60 degree.
View attachment 24726
First spotted a broken antenna on one side
View attachment 24727
Position which is believed to be okay for the ring. The center of gravity here will be close to the ring on top and thence it will not make it wide open with the time and break it.
View attachment 24728
Advice
My elder cousin is in Maruti (One of the finest companies in India) as Vice President Engineer, and he has suggested that I should go with simple beam or high gain antenna and not this one and keep it as perpendicular to avoid further issues. He said that usually antennas like this have metallic ring to withstand the weight. He designs cars - I am sure that I can trust him on this analysis.