**BUG**
Concise problem statement:
Saving PCB fails most of the time, sometimes for hours. Problem exists for two days now.
Steps to reproduce bug:
1. Login
2. Change PCB
3. Try to save as PCB
Results: Most of the time (90% or so) I get "Network error". Sometimes I cannot save for hours.
Note: saving as PCB Module seems to work most of the time, even when saving as PCB fails.
Expected results: Save PCB without problems.
Browser: Opera 45
My network connection is ok. Ping to easyeda.com around 26 ms, 0% packet loss.
