Manually updated back to latest firmware. No long locking up. Logs show that it's not checking for updates every 10 mins. Pretty sure they're server messed up and they took it down to fix it. Auto updates are turned off, but it was still checking any...
Downgraded firmware to previous version and the router has not locked up in the last 40 mins. This might be a server side issue on ASUS for the firmware check.