the main problem was the WIFI connection, WIFI is sometimes blocking,showing the icon but it has no connection, to activate it i need to go into airplane mode, wait 5 seconds, then switch to normal again. Only then i have a good WIFI connection. but i have to repeat this every time the phone comes out of sleep mode.
I have done several updates en upgrades. but nothing seems to work. I tried B112 firmware and the B510 and B512. recently upgrade from android 4.2.2 to 4.4.2, first with B634 firmware and now B635.
Still the same problem, Does anyone have a solution for this.
Thanks in advance !!