Problem with wireless alarm

Hello everyone I need some quick help.  I have a Ademco Lynx and set
it up myself thanks to all the help from this forum and the home
security store forums. Its a completely wireless system.

When I came home today I did not hear a entry beep from the alarm
panel. This startled me because I know for sure I turned it on. I went
to investigate and I set off the motion alarm.  I thought at first
maybe just the sensor was malfunctioning or it was a low battery.
After more testing I realize none of my wireless devices will work
from that side of the house.  I now need to be in the same room to
turn on the alarm with the fobs.

I'm not really sure whats going on with it. Could it be some sort of
new interference in my area or a malfunctioning panel? I have tried to
unplug the power and battery but still seems to be doing the same
thing.  I would appreciate any trouble shooting advice you can give
me.

thanks