Now i have tried also another microsd sd hd 32gb verbatim class 4 besides another kingston microsd 32gb class 4 and archos gamepad 2 has the same behaviour, it recognizes class 4 microsd only half the times ,at device start or restart.  While it always  recognizes another 16gb microsd samsung class 6.  I have an updated firmware. I think you have to correct some bug and make another firmware update.

Update: it always recognizes also a "micro sd hc 4gb (without brand) class 4" , so it isn't a matter of class (4). but a problem with 32 gb microsd hc . 

Furthermore the "32gb microsd hc" that i have are always recognized by archos gamepad 1 !