Could be a weather issue in your area or at the gateway; could be a technical issue at the gateway or in the modem. The HN reps on this site may run remote diagnostics to see what's going on. Hang in there.
Thank you for reaching out, I would be happy to assist you regarding this issue. Please send me a private message with the SAN or the phone number registered to the account.
For reference, when experiencing a technical issue, please only reset the modem when instructed to by a rep. Resetting the modem incorrectly, or in the wrong instance, can actually cause more harm than good.
By "reset" I'm referring to utilizing the reset button on the back of the modem.
I hope you're back online soon.