Spurious disconnects with hostapd on RaLink RT2561/RT61

[Ciprian Ciubotariu]

I have tried to pin this on the client, but with another client I experience 
the same behavior.

lspci -v -s 02:06.0
02:06.0 Network controller: RaLink RT2561/RT61 rev B 802.11g
        Subsystem: D-Link System Inc DWL-G510 Rev C
        Flags: bus master, slow devsel, latency 64, IRQ 17
        Memory at ff5f8000 (32-bit, non-prefetchable) [size=32K]
        Capabilities: [40] Power Management version 2
        Kernel driver in use: rt61pci

uname -a
Linux pinky 2.6.29-hardened #10 Mon Dec 14 11:55:39 EET 2009 i686 AMD 
Sempron(tm) Processor 3000+ AuthenticAMD GNU/Linux

hostapd -v
hostapd v0.6.9
User space daemon for IEEE 802.11 AP management,
IEEE 802.1X/WPA/WPA2/EAP/RADIUS Authenticator
Copyright (c) 2002-2009, Jouni Malinen <j at w1.fi> and contributors

If there is any other information that might help you (and through that, me) 
debug this, please inform me.