i have my line problem also in many request time out when i ping for sample web site like 'www.google.com'.
Usually is like in 10~15min, it will have 1min request time out like that.
i possible confirm that is disconnected already. But i check my SNR margin....it is above 30 which is normal and won't get line disconnect problem~
maybe the router/modem setting will cause the disconnection happen??