Probably due to heat I notices that antennas are not holding their positions anymore. Antennas are going down like dying flowers. When I first got it, antennas were tightly holding, now they are spinning almost freely.
How do I fix it ?
This has come up before: http://forum.mikrotik.com/t/rb4011-loose-antennae/155202/1
No known solution that I am aware of.
Lubricate with vegetable oil (I used sunflower oil) after a while the oil will be absorbed into the plastic and the antenna will hold tight.