ichmoimeyo, thanks a lot for that tip ! It is also good for the 770, I have it written down now with some other useful ones :-)

Actually, I could not check back here until today, and a strange thing happened in between : I haven't been using the tablet much these last few days, except for MaemoMapper+GPS, but it wasn't turned off either. And when I checked the connections list yesterday, out of curiosity, the new "phantom" connection was gone, and all the previous ones were back !!

Is this strange, or what ? On 7/16 when I posted my SOS, I could not get them back after several shutdowns and reboots - and now it looks as if nothing ever happened, and it hasn't even rebooted... Oh well :-)