FW13 AMD Qualcomm 7800 disappears during sleep

I have installed a qualcomm 7800 wifi card in my AMD FW13. This has been reliable for the last months but as of Monday this week, every time that the laptop goes to sleep the card disappears from device manager. The only way I can get it to reappear is to shutdown the computer and power it on again. A reboot does not make it appear. It started after I changed my power limit to 100% from the 81% I leave it normally as I am away on a business trip (best time for wifi to break of course).
Anyone have any ideas?

Thanks

Tim