I have a LinkSys AM200 ADSL modem. It's been in use for 2 years without problems.

Usually when I am not using the Internet, the Internet LED is a steady green, indicating a connected session. For the last few days, it has been blinking - twice a second, rest for a second, repeat. The User Guide does not mention anything. The others two LEDS (Ethernet and DSL) are solid green.

Does anyone know what the cause may be?

All other Internet functions seem OK. My ISP has not seen anything weird when they check the line logs. LinkSys says that the product is out of warranty and wishes to charge me for any support.