When I'm gaming (playing dota 2) my ping is fine but when someone comes home and their phone automatically connects to the Internet, I start getting pings of 250-1000ms for a short period. The router from the front door is quite far but it's centralised for everyone in the house (about 4-5 metres from me). My two other brothers who also are gaming as well don't have the same issue (one is connected through Ethernet cable and the other through wifi card). I'm connected via wifi card on my PC. Please help!!