please help my router reboot

RouterOS Wireless Networking
1

I have two wireless card, one is running 2.4Hz other 5.8Ghz. The two wireless cards are attached to the same bridge and I have the bridge attached to ether1. But recently I noticed that my router reboot each time both wireless cards attached to an antenna is enabled. I disconnect the 2.4Hz from the antenna and the radio stops restart by itself.
The radio is powered with a separate power cable with Dc adaptor 24v 0.8 mA. Please what could be responsible for this? if I disconnect one of the antenna the radio become stable and stop restart.

N.B
My card is 1watt on 2.4Hz & 500mW on 5.8Ghz.
Thanks

2

What are the models of the used wireless cards ?
What is the RouterBOARD model, which is used ?

3

Probably not enough current to power the radio cards, get a higher rating DC adapter