I have having some problems with the 2.4 band on my laptop after upgrading to the latest firmware. What i did was factory reset afterwards and i haven't had any problems since. You could try that.

I have my brother printer setup wirelessly, i just had to use the wps button and download some software for the printer itself. Hope that helps.

I'm going to wait until it's stable and out of beta, because as of now i'm having no problems.

Have you tried upgrading the firmware to the latest version? I never had any problems with the range of my c9 but with this latest firmware update the signal is much stronger and so are the speeds.