點解我上網連左一陣線之後會自動下線??

個供應商唔穩定,[多數因為你住果頭工程進行緊,佢d線有問題,接觸不良],你可以打電話問下,因為我之前都係咁[接觸不良,個師父馬虎...幫我攪返好果個師父講]...所以建議你打去供應商到反映下...佢有義務serve你的...
實例:個cable頭同cable線駁得唔好,成日cut下on下..好q煩.後尾個師父認認真真幫我攪返加check個電話線盒

呢d多數係供應商問題,打電話叫人黎最實際

there's a chance that you got some virus or adware(spyware). They will get your connection, so that you can't get on internet or offline suddenly. Get scan spyware program and scan your computer, lot of spyware program is free. (adaware)I think...