hello there.
I started with the ethernet shield and blynk . i have been facing the same issue and had been struggling with it for the last 100hrs. After some RnD, i stumbled upon your post and found that i am having the exact issue just like yours.
the last sketch as u tried, my serail monitor showing this
[0] Using static IP
[0] Blynk v0.3.1
[1300] My IP: 0.0.0.0
[5001] Connecting to 10.0.0.10:8442
[10002] Connecting to 10.0.0.10:8442
[15003] Connecting to 10.0.0.10:8442
[20004] Connecting to 10.0.0.10:8442
[25005] Connecting to 10.0.0.10:8442
[30006] Connecting to 10.0.0.10:8442
[35007] Connecting to 10.0.0.10:8442
[40008] Connecting to 10.0.0.10:8442
[45009] Connecting to 10.0.0.10:8442