All of the 802.11a performed down so many time

Hi all:
I encounter a problem on mesh wireless system. All of the 802.11a on RAP are "administritivity down" after few hrs or mins of startup.
After i check the "show controller Dot11radio 1" it shows "Last radio rest code : 49"
Could some one help me on this? My country code is Saudi arabia. And Both 802.11a/n and 802.11 b/g/n

1. I found there are 2 frequencies wild in the list, 20hz and 40 hz, which one is better ?
> 40mhz will combine two adjacent 20mhz channels, so in your case maybe 20mhz
2. I check the country code from the list, that Saudi is in -E zone, how to move to -M ?
> YOu can add a country code on the WLC, but you can't change an access point contry code
3. In 802.11a TPC option, i found 2 options. one is coverage optimize V1 , another is interference optimize V2. Base on my current situation, which one is better ?
> DO not use v2
4. I found some channels have heavy radar signal interference, how can i exclude them to channel list.
> In the DCA list, you can choose the channels you want. You can find the info here:
http://www.cisco.com/en/US/products/ps6366/products_tech_note09186a0080a3443f.shtml
Thanks,
Scott
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