In the last few days, the WiFi on my Nexus 7 has almost died completely. I have to be within a few feet of the hotspot before I'm getting any signal. At first I thought it might have been a problem with the phone I usually use, but I'm experiencing the same issue with other hotspots as well. This is very frustrating as I need to be almost on top of the hotspot for it to connect and where I am, mobile phone (cellphone) coverage is variable.

Is anyone else having these issues? Can anyone recommend a fix, or do I need to take it back to the shop?

BTW: The machine has not been dropped (lately,anyway ) and all has been working well up until now.