Smart Bulb RGB Sonoff on rb951ui-h2nd

Hi, i have a big problem. I purchased last week a rgb bulb sonoff, when i conect it to my mikrotik rb951ui-2hnd via wifi it turns off within 10 minuts and lost conection, so i have to switch it off and turn it on again. Making a a very very hard investigation (changing everything in mikrotik’s wifi configuration haha) i discovered that under the estandar 802.11g the bulb works fine, but my internet speed conection gets very slow, so i need it to be configured on 802.11n. In adittion, if i test the bulb on other router, it works well on 802.11n, so the only thing that comes to my mind is that there is a problem with the implementation of the estandar 802.11n on router or a default configuration is making the bulb to fail. Please, i really apreciate any help. Greetings!