Today my wireless interface went down. It is 2.4 Ghz AP in bridge mode to the ethernet. It has been running good for some time now (about a year). When I logged into the Mikrotik, I found that there was NO “R” next to the wlan interface. I remember this actually happened to a back-haul once and I ended up just doing away with it as it wasn’t really being used at the time. I was thinking that the “R” will not appear unless someone is registered to the AP, but I could be wrong. Here is the show interface print…
[admin@Perino] > interface wireless print
Flags: X - disabled, R - running
0 name=“wlan1” mtu=1500 mac-address=00:15:6D:20:05:6B arp=enabled
disable-running-check=no interface-type=Atheros AR5213
radio-name=“00156D20056B” mode=ap-bridge ssid=“essex” area=“”
frequency-mode=regulatory-domain country=united states antenna-gain=9
frequency=2412 band=2.4ghz-b scan-list=default rate-set=default
supported-rates-b=1Mbps,2Mbps,5.5Mbps,11Mbps
supported-rates-a/g=6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,54Mbps
basic-rates-b=1Mbps,2Mbps,5.5Mbps,11Mbps
basic-rates-a/g=6Mbps,9Mbps,18Mbps,24Mbps,36Mbps,54Mbps max-station-count=2007
ack-timeout=dynamic tx-power-mode=default noise-floor-threshold=default
periodic-calibration=default periodic-calibration-interval=60
burst-time=disabled dfs-mode=none antenna-mode=ant-a wds-mode=disabled
wds-default-bridge=none wds-default-cost=100 wds-cost-range=50-150
wds-ignore-ssid=no update-stats-interval=disabled default-authentication=yes
default-forwarding=yes default-ap-tx-limit=0 default-client-tx-limit=0
proprietary-extensions=post-2.9.25 hide-ssid=no security-profile=default
disconnect-timeout=3s on-fail-retry-time=100ms preamble-mode=both
compression=no allow-sharedkey=no
I tried rebooting the Mikrotik of coarse, but had nothing change. Is this a sign of a burned up card, antenna, or some stupid setting that I’m overlooking? Thanks for reading and helping! 
LP