Hi Paulo. Sorry to hear about the trouble.
What version of ZoneFlex are you running?
What is the result if you connect to the wired port on the AP's?
Do you see any packet loss (run a ping test)?
Your mesh links use the 5Ghz band which requires proper distance planning for the mesh nodes (and limited interference from walls, etc). Have you tested with the nodes in close proximity?
This Best Practice guide should also help - http://c541678.r78.cf2.rackcdn.com/ap...