today..tm technician came to my house to install modem etc2(i apply the unipack btw)

so, the 1st unit Innacomm W3400V Wireless Modem..he installed it and it works...for 3 minutes oni..after that the modem keeps disconnect/reconnect..cant access via wireless sumore..

then, he swap with another unit(same model)..it works fine now..

currently, im using a desktop n laptop connected to the unit via wireless..to my concern my hp cant connect with the modem..same goes with my bro hp..limited to 2 devices oni ka?
and my torrent is running amazingly-super-slow nau ..slower than before(before i use 512kbps nau 1Mbps)..

so, is it me only or u also think that these modem brand/model with useless?..now im thinking to buy another one..any advice?..to buy or not?if yes any recommendation on what good brand(im thinking of aztech)..