You can switch to the following URLS
- http://52.10.46.160:3013/v2/blocks/top
- http://18.195.109.60:3013/v2/blocks/top
- http://13.250.162.250:3013/v2/blocks/top
- http://31.13.249.70:3013/v2/blocks/top
And ‘account not found’, i guess it’s not mined new block yet