check your phone line, it is advisable na isang lang ang phone gamitin at walang extension ng dsl line , baka kasi shorted yung mga wires na naka extension
check utp cables from computer to phone line,
I have removed the phone from the PLDT provided phone/data splitter and I still have the 1-minute disconnection after every few minutes.
I don't think there's a problem with my UTP since I don't get disconnected when I use this with SmartBro.