Now I have had the time to test it i can say that I too have the same WiFi connection problems as others have reported here on my MXQ M12CX S905X box with the new 12e build. Fine with 12d if I revert back to it.
As I use Ethernet on my main box the main thing is for me that the remote/keyboard control freezing for sometiems several minutes when starting a video stream is much better now with 12e, taking a fraction of the time as it did with 12d and earlier to restore control.
Cheers
RayW