3Com 589D on a Dell laptop with QNX

I got this Dell Latitude laptop and are using a 3Com 589D pcmcia network
card (10Mbit), this card works just fine in Windows and Linux.

but in QNX the net only works for abt. 4 seconds every 30 second. (!) any
ideas how to make this more stable?

Using QNX RTOS just downloaded from the qnx site.