I have a Smart V8 and sometime when I got out of range of a WiFi network I'm connected to it seems to have issues switching to the mobile network for data.
Apps will start complaining about lack of connection. The signal icon just shows the standard signal icon rather then 4G, H+ etc.
My fix is to disable and then reenable Cellular data. The signal icon immediately switches to 4G.
This usually happens when I walking. It may happen when driving but if it does it normally fixes itself by the time I next check the phone.
I don't think it is network related. I recently switched from Voda to Skinny and the problem happened on both networks with this phone.
Anyone else seeing the same problem?