[Q][solved] wlan problem on Mini Pro

Hello and Sorry my bad english

But I got wlan problem whit my rooted and cyonogen mod 9 installed mini pro

I cant download over wlan connection big apps from f-droid or straight from the internet. I have managed download Irssi and AdAway apps put i cant download firefox(or any other browser) on my phone on wlan connection because downloads allways stop on about 20%. The wlan usually works 2min on web suffing and then it stop working.
I have to reboot my phone or turn of the wifi and then turn it back on, but it will work only 2min again.
I have installed the cyanogen mod again but that didnt help me. My phone worked fine a month before this problem start.
I have sooner some wlan dropping problem put i managed fix that problem by removing this file /data/misc/dhcp/dhcpcd-wlan0.lease

I am very happy if someone can help me because i have very slow mobile internet.

Sorry my bad english.

Problem fixed. My wlan router only need reboot. (I didnt think that the problem was on modem because internet connection was working good)