I can definitely appreciate how frustrating this situation must be. I did check from this end and the modem is reporting poor signal levels. I'd suggest checking all of the cable connections to ensure they're hand tight, bypassing any cable splitters you may be using, and/or testing the modem at a different cable outlet if you have any. Should all of that fail it may be time to see about scheduling a technician to come troubleshoot further. If you require any assistance getting that setup feel free to email us at cox.help@cox.com and be sure to include your account information and a link to this thread would also help.
-Chris