Why my wireless modem keeps pops out a command of phone line not plug in.?

pinky3040

New member
I just purchase a wireless modem, everything works fine but recently the internet start turns to very unstable and keeps pops out a command ' telephone line not plug in ' .
When this command pops out, my telephone line is properly plug in and working fine, i didn't even touch it.
May I know why my wireless modem turns to become like this? Is it because of the splitter/router/modem/pc problem .?
Please kindly advised.
 
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