I am running RB951G-2HnD at OS 5.26 and periodicaly meet with problem that Wi-Fi on iphone or ipad stalls, no data revieved by WI-FI on 2 apple devices. It looks like Wi-Fi signal is ok, but no data with Wi-Fi can be recieved for some period of time. If i try to wait for 1..2 minutes then Wi-Fi continues to work. If i switch Wi-Fi off on iphone(ipad) and then turn it on again, Wi-Fi working fine again. Internet on Ethernet ports not affected this problem and working without any problems.
I had tried simle test on iphone when Wi-Fi stalls. First os all to ping 213.87.200.2, reply recieved only few times, then i try to ping 8.8.8.8, after some timeouts i got reply from 213.87.200.2 and then ping and all data from Wi-Fi start working fine.
I have tried to change Channel Width, Frequency, Country with no success. Tx Power sets to 15, Wi-Fi on iphone is exelent and i can recieve/sends data up to 30 Mb/sec on iphone.