My mobile phone keeps disconnecting

So I recently moved into my apartment and bought my X-fi gateway and everything worked great. For the first day. Now my phone just keeps randomly disconnecting from my internet only to reconnect a couple seconds later. Often times it doesn't even do that and randomly the download arrow on the top right turns off while upload remains working and stay like that for a minute or 2 just to turn back on again. This problem isint prevelant with my desktop or smart TV but only phones, even when guest come over they say they have the same problems and it's starting to get really annoying. Can someone please help me out here?