@mpo881 in last few days many things happen, so you may be affected by one of them.
- Exploit that uses Cisco routers vulnerabilities. All ISP providers have that equipment and in last recent day many ISP providers all over the world have problems with connectivity;
- Our hoster had a bit another issue in the USA datacenters (for last 2 days). At the moment they are fixed.
- Few changes on the blynk side regarding new connection ports (8442 -> 80, 8443 -> 443).
If you still have connectivity issue - please provide more info like serial debug print if posisble.