Update.
Found what happened, for all those could have the same problem...
My B4i app is increasing the size because I'm programing new features according it's being completed to fit the project requirements. I didn't find anything wrong in my network... then I think: I started to get some timeout error trying to compile when the size of project/app exceeded 2.1 Mb.
Then eureka: this is time dependent... it's a framework timeout. Searching in B4i I found in menu: Tools -> Ide Options -> Configure Process Timeout.
After setting 120 seconds I'm not getting any error anymore.
I hope that this information can be useful for somebody in community that could be getting the same problem.
Procedure: big project in B4i -> INCREASE PROCESS TIMEOUT.