Constant loss of connection

[naox]

Software
XBian version: 1.0 (knockout) updated to today.
XBMC/Kodi version: 17.1
Overclock settings: none

Hardware
Device type and model (e.g. Raspberry Pi Model A/B 256/512 MB, CuBox-i i4Pro, ...): Raspberry Pi 3 Model B
Power supply rating: 2.5 A, original
SD card size and make/type: 2GB
Network (Ethernet or wireless): Wireless
Connected devices (TV, USB, network storage, ...): TV via HDMI

Log files
Link to logfile(s): not provided

Problem description:
Since about one or two weeks ago, after a period of time that i'm don't know (maybe 3 hours?) I can't connect to my raspberry/xbian by ssh. If I have tranmission running I can't connect to it neither, the same happen to kodi. The only things that I have running in background are a script to update my ip for freedns.afraid.org and this script https://github.com/niqdev/packtpub-crawler.

The problem happens at the same network and I have the raspberry connected by wifi.

Any ideas? maybe a driver problem? hardware problem?

How to reproduce:
Restart the raspberry and wait.