BB Torch :: 9800 Crashes Wifi Networks?

When I use my phone on Wifi, it works fine for about 10-15 minsutes and then crashes the router that it connects to making the internet on the whole network go down. this happens at home, at other peoples homes, at work or even in public wifi areas like hotels or retail stores (yes I've tried it a few different places)I've tried calling my phone provider a long time ago and they were stumped at this issue but since the wifi technically works the stores refused to do anything on a warranty basis while it was still active. It's not like wifi is a must for me, the internet speed on the torch is still quite slow and I have tons of data on my plan that I don't use but I wouldn't mind getting it fixed so that I can actually turn on my wifi antenna without worrying about crashing everyone's networks.