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Some DSL routers I've used in the past did something similar where it seems to be related to how they deal with and recover from noise on the line. For example, on Smart Telecom's (former ISP here) earlier DSL router model, if there was excess noise on the line such as the DSL line passing someone's home who operates welders, power tools, etc., it would resync the connection to achieve a 15dB signal-to-noise ratio. However, when the interference went away, the DSL router remained synced at that lower speed until it was rebooted. My brother had this issue and had to keep cycling the power each morning to get the speed back to normal. Most of the newer DSL routers seem to periodically resync to adapt to line conditions. The main problem I've had with this is the Internet connection being interrupted during each resync with long cable runs, so I'm using one that seems to stick whatever it synced at until the next reboot. One of my past ISPs use to trigger a resync around 12:30am each day. If this happens again, one idea would be to use a plug-in timer that cycles the power every night at 3am.