BCM4322 keeps switching band frequency

[Can selcuk]

Hi I do have an old macbook (late 2008) with an embedded BCM4322 
wireless device. I use the b43 driver and I keep getting 
disconnected/reconnected as the driver switches band frequencies ..  I 
always had this issue with all the kernels I used. Do you guys have any 
idea how to force the driver working at a single frequency ??

dmesg :

[   58.001746] b43-phy0 debug: Switching to 2.4 GHz band
[   58.174227] b43-phy0 debug: Switching to 5 GHz band
[   58.592232] b43-phy0 debug: Switching to 2.4 GHz band
[   58.763176] b43-phy0 debug: Switching to 5 GHz band
[   59.184229] b43-phy0 debug: Switching to 2.4 GHz band
[   59.355203] b43-phy0 debug: Switching to 5 GHz band
[   59.776220] b43-phy0 debug: Switching to 2.4 GHz band
[   59.947211] b43-phy0 debug: Switching to 5 GHz band
[   60.368227] b43-phy0 debug: Switching to 2.4 GHz band
[   60.539231] b43-phy0 debug: Switching to 5 GHz band
[   60.960210] b43-phy0 debug: Switching to 2.4 GHz band
[   61.135034] b43-phy0 debug: Switching to 5 GHz band
[   61.552285] b43-phy0 debug: Switching to 2.4 GHz band
[   61.723233] b43-phy0 debug: Switching to 5 GHz band
[   62.145194] b43-phy0 debug: Switching to 2.4 GHz band
[   62.321226] b43-phy0 debug: Switching to 5 GHz band
[   62.736254] b43-phy0 debug: Switching to 2.4 GHz band
[   62.913209] b43-phy0 debug: Switching to 5 GHz band
[   63.328209] b43-phy0 debug: Switching to 2.4 GHz band
[   63.500552] b43-phy0 debug: Switching to 5 GHz band
[   63.920224] b43-phy0 debug: Switching to 2.4 GHz band
[   64.094227] b43-phy0 debug: Switching to 5 GHz band
[   64.512215] b43-phy0 debug: Switching to 2.4 GHz band
[   64.685221] b43-phy0 debug: Switching to 5 GHz band
[   65.112208] b43-phy0 debug: Switching to 2.4 GHz band
[   65.284251] b43-phy0 debug: Switching to 5 GHz band


uname -a

Linux djanboox 4.9.6-gentoo-r1-nouveau-kernel #2 SMP PREEMPT Wed Feb 22 
12:25:07 CET 2017 x86_64 Intel(R) Core(TM)2 Duo CPU P7350 @ 2.00GHz 
GenuineIntel GNU/Linux

lspci -vvn|grep 43 -A7
03:00.0 0280: 14e4:432b (rev 01)
	Subsystem: 106b:008d
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 256 bytes
	Interrupt: pin A routed to IRQ 20
	Region 0: Memory at 93100000 (64-bit, non-prefetchable) [size=16K]
	Capabilities: [40] Power Management version 3
--
	Kernel driver in use: b43-pci-bridge

Best,
Can