Situation: Three AP800 in a house, each running on a wireless channel 1,6 and 11 so there is no overlap in signal. at no fixed time in the day the SSID's are available but when you try to connect with a device it fails, you cant even access the AP800 URL login till its been Physically power off and on again. Open to ideas on how to solve this issue.

(One thing I noticed when one of the AP800's wouldn't let me connect, after a power cycle I logged in to the settings but it wouldn't let me speed test the network)

Things Tried:
Changed all Wireless Channels on all three
IP's Set out of DHCP range
Disabled Multiple SSID function ( just using one SSID each)

try change the dhcp range example the first 192.168.1.50 -100, the 2nd 192.168.1.101.150, 3rd 192.168.1.151-200
also there is a new firmware at ftp Taiwan 1.1.4.1 with few fixes
ftp://ftp.draytek.com/VigorAP%20800/Firmware/v1.1.4.1/