Wifi issue on BlackBerry passport SE

After turning my wifi on, my passport connects to that wifi network but after few minutes it automatically disconnects from that network.After that when i try to reconnect it doesn't connect.Everytime i have to restart my router in order to reconnect my passport to wifi.This is strange as this does not happen to my iphone, ipad or laptop.Whenever i connect my other devices to wifi it stays connected till i toggle wifi off on that device.The problem is only with my passport of all the devices i have.I am enjoying using my passport for the last 8 months.This is the only problem which forces me to use iphone when i am in a need to use wifi.
Kindly suggest me some solutions if anyone have any idea about this.

Posted via CB10

try to manually assign a IP address to your Passport.

Also try to use less congested network. Ex. If your other devices are on 2.4GHz move your Passport over to 5GHz