The only thing I recall was disabling voice mail notifications. But I think at that time it wasn't connecting anyway. Another major change is I switched to other mobile provider so changed sim card as well (and saved new gsm network connection received via operator message). How could that possibly affect wifi, no clue.

In the matter of fact I already had deleted .grob directory before 1st post here. It was a bit of puzzle to find proper directory as I didn't know the process name. But after killing few processes I found the proper one and that lead me to, as you stated, /home/user/.grob
Unfortunately that didn't helped too.

Last thing I tried yesterday was reinstalling (remove, then install) grob package with apt-get. No success though. The only side effect is I've got two Web icons on desktop now (when removing browser.desktop from /usr/share/applications both disappearing, and both getting back when recovering the file o_O)

To add some spice, a I see now that facebook app is affected by this connectivity issue as well. On the other hand for example fennec and email working just fine.

Is there any way of debugging grob or maybe a log file?