Slow internet

This morning my internet was fine, running fast as usual. About 2 hours ago it became really slow, for no apparent reason. I wasn’t doing anything out of the norm, it just became running slow. I disconnected my modem [exterior] from the plug, waited 30 seconds, and plugged it back in, and it was still slow. I have Rogers Yahoo! High Speed Lite cable internet, and it usually runs at 264 kbps according to the CNET bandwidth test. I really don’t know what’s wrong and I need help fixing this. If any of you need more info to determine the problem, I’ll be glad to provide it.

Thanks,
Mike