Hi Sergey, thanks for your reply!

I can't tell you if I'm using certificates to connect to internet... Anyways, following your advice I changed the settings to connection on background and email now syncs every 30 mins! Since I made this change my 3g connection icon has not disappeared from the connections menu as often as it did.

Now I've also added my wifi connection to automatic and everything seems to be working just fine!

I haven't changed my N9 to Developer's Mode yet, but as soon as I do so I'll post the errors (if they occur) ok?

Once again, thanks for the support!

=)