WIFI suddenly very poor on my MBPro

I used to be quite content with the WIFI reception on my MBpro but lately it has become quite poor.
In work I used to get full or nearly full bars, just like the other MBpro (same model as mine) and Macbook that share the room. Lately I can only manage 1 bar at best and experience constant drop outs. The other two macs have experienced no loss of signal. There are no other computers using the network either.
I've also noticed at home that my Girlfriends Macbook has a far greater range than my more modern MBpro, and her macbook doesn't appear to be affected by things such as a door closing or a microwave working while mine loses all signal.
This is quite frustrating as the problem only started in the last couple of months. Could it be a software issue?

Click on the Airport icon in the Finder menu bar. Make sure your name is selected - a check mark next to your name.
System Preferences/Internet & Network/Network
Unlock the padlock
Locations: Automatic
Highlight Airport
Click the Assist Me button
In the popup window click the Diagnostic button.
How to diagnose and resolve Wi-Fi slow-downs

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