Are you using a wired connection or Wi-Fi for your hub? If Wi-Fi, try a wired connection, which is likely to be more reliable (though it should work either way). That pattern of blinking LED indicates. a network connectivity problem. If you need to use Wi-Fi, make sure you are on the latest platform version (under Settings > Check for Updates--once you're able to get in), as there have been some Wi-Fi connectivity fixes in the most recent build as well as likely a few in the past.
A reset of the hub itself can only be done via software. However, a network reset is available via a hardware button. Use a small blunt object to hold the round button on the bottom of the hub (only round indent in a sea of squares) for 7 or more seconds. The LED should blink a couple times, then turn blue as the hub reboots (like it normally does when booting). If wired, it should be discoverable on your network (use your router tools or findmyhub.hubitat.com to find it); if Wi-Fi, you should be able to go through the initial Wi-FI setup procedure on the hub like you did the first time (connect to the special SSID and configure it). The network reset procedure is also documented here: Network Setup | Hubitat Documentation
Support and warranty service are both available via support.hubitat.com, though staff also monitor the forums and you're likely to get pretty good help here as well. However, I'd try the above first.