Hello,
Let me quickly introduce myself before I bother you with my problems !! 
My name is Steve, I leave in the East of France, near Strasbourg, and I am the (happy) owner of a Mazda 6 (2008 model), bought second-hand at the end of 2011.
This car was equiped with an AVIC-F700BT (so it's a european model) already upgraded to CNSD-100FM, which I upgraded to latest possible official firmware at the beginning of 2012, here is the version displayed today :
- "Version de la carte : 02.000600"
- "Version : 3.021000"
All was working fine (except some minor bugs and the fact that it's a bit slow) until this summer.
Suddenly, without having done any special operation, the navigation part became unusable because very very slow. Here is what happens :
as soon as the unit goes to "map" mode (by pressing "map" physical button or "carte" touch button), and after pressing "OK" to pass the nag screen, the unit become very very slow, almost unusable, each touch on the screen only gives a result many seconds or minutes later, the map displays very slowly and is incomplete, and also displays with delay compared to the real position. This also happens if I receive a hand-free call via bluetooth from my mobile (in this case the unit switches to map mode, whatever the current mode is).
The only way to have control again is to press the "menu" physical button and wait some long seconds before the menu appears. Starting from here, using other modes is OK : parameters (other than those concerning navigation), and audio modes (SD, USB, CD, tuner).
The unit becomes also very slow if not unusable when trying to access the navigation parameters : the nag screen displays, after pressing "OK" the map never appears and nothing seems to happen, and sometimes if I'm lucky after some minutes the unit goes back automatically to the menu screen.
I tried the following things in order to solve the problem :
- reset : no success
- disconnect for some minutes the car battery and reconnect it : success, but only for some minutes, then suddenly the navigation mode hangs again
- removal of the SD card + removal of the USB key + disabling bluetooth connection : no success
Does anyone knows what is the problem ? Is there any way to restore full normal functionning of the unit ?
Apart this, I always have a minor but annoying issue : every time the unit is restarted, it forgets what it was playing before :
- the least annoying case : it remembers which audio files it was playing, but starts from the beginning
- often, it starts again whith the first file of the SD if it was playing from SD last time, or the first file of the USB if it was playing USB last time
- the worst case, also happening often, is when it was playing some USB file and restarts by playing the first file of the SD
Is there any way (configuration, update, patch, hack, ...) in order to have normal behavior for this : remember where it stops and restart here ? Or at least, restart the file it was playing ?
And one last question : is there any mean to buy/get some map update (CNSD-300FM/CNSD-350FM ?) for this unit and how ?
That's a lot of "blabla" and I apologize for my poor English writing, I hope someone understands what I wrote !
Thanks a lot in advance for any help/advise/solution !
Regards 