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Welcome!- What Hardware version is your modem? Look at the sticker under modem.
- Link>What Firmware version is currently loaded? Found on the modems web page under status.
- What region are you located?
What model # is the DSL modem?
Review the user manual to see what the LED indicate for the modem.
I recommend that you have your ISP check the cabling going to the ISP modem, check signal levels going to the ISP modem. For DSL or Fiber service lines, ensure that the ISP is using good working phone or cable lines to the DSL modem and that the phone lines are filtered correctly. I recommend having the ISP service physically check the lines going from the out side to the ISP modem. Connecting to the ISP modem could result in a false positive as the signal to the modem could be just enough to that point then adding on a router, could see problems.
The router operation is dependent upon getting good data flow from the ISP modem and the modem is dependent upon getting good signal from the ISP Service.