The wifi network went down at  01:19 UTC, Jun 26.  Here are the log entries from the AP24:

jun/25 17:01:32 dhcp,info,debug wlan2-dhcp1 assigned 192.168.14.39 to 00:20:F6:05:24:7F
jun/25 17:17:51 wireless,info 00:20:F6:05:24:7F@wlan2-Ext-Ant: disconnected, reassociating
jun/25 17:17:51 wireless,info 00:20:F6:05:24:7F@wlan2-Ext-Ant: connected
jun/25 17:25:08 dhcp,info,debug wlan2-dhcp1 deassigned 192.168.14.245 from 00:12:3F:F6:73:20
jun/25 23:52:39 wireless,info 00:20:F6:05:24:85@wlan2-Ext-Ant: disconnected, reassociating
jun/25 23:52:39 wireless,info 00:20:F6:05:24:85@wlan2-Ext-Ant: connected
01:19:47 wireless,info 00:20:F6:05:24:7F@wlan2-Ext-Ant: disconnected, reassociating
01:19:47 wireless,info 00:20:F6:05:24:7F@wlan2-Ext-Ant: connected
01:25:49 wireless,info 00:20:F6:05:24:85@wlan2-Ext-Ant: disconnected, reassociating
01:25:49 wireless,info 00:20:F6:05:24:85@wlan2-Ext-Ant: connected
01:35:13 wireless,info 00:20:F6:05:24:7F@wlan2-Ext-Ant: disconnected, extensive data loss
01:35:15 wireless,info 00:20:F6:05:24:7F@wlan2-Ext-Ant: connected
01:40:47 wireless,info 00:20:F6:05:24:85@wlan2-Ext-Ant: disconnected, reassociating
01:40:47 wireless,info 00:20:F6:05:24:85@wlan2-Ext-Ant: connected
01:45:38 wireless,info 00:20:F6:05:24:7F@wlan2-Ext-Ant: disconnected, reassociating
01:45:38 wireless,info 00:20:F6:05:24:7F@wlan2-Ext-Ant: connected
01:58:15 wireless,info 00:20:F6:05:24:85@wlan2-Ext-Ant: disconnected, extensive data loss
02:01:23 wireless,info 00:20:F6:05:24:7F@wlan2-Ext-Ant: disconnected, reassociating
02:01:23 wireless,info 00:20:F6:05:24:7F@wlan2-Ext-Ant: connected
02:04:14 wireless,info 00:20:F6:05:24:7F@wlan2-Ext-Ant: disconnected, extensive data loss
02:26:13 system,info,account user admin logged in from 192.168.13.1 via ssh

The mac address ending in 24:7F is EantG and 24:85 is EantH.  Both show "extensive data loss".

EantG also died last night - perhaps in a similar manner. 

 A frequency scan on the AP24 doesn't show any current interference. The external antenna on the AP24 is using frequency 2437 MHz.

interface wireless frequency-monitor 1
FREQ          USE
2412MHz       0%
2417MHz       0.4%
2422MHz       0%
2427MHz       0.2%
2432MHz       0.4%
2437MHz       1.8%
2442MHz       0%
2447MHz       0.6%
2452MHz       0.2%
2457MHz       0.5%
2462MHz       0.4%

Will change it to 2462 MHz (as a hack),  power cycle the Eants and go home...

 interface wireless set 1 frequency 2462