Same problem for a long time.

So, i try everything and found solution working for me. WiFi is mode only G, chain 0 tx/rx is disabled. And now all client has good CCQ about 24/54Mb before was 1/150mbit. When i enable chain 0, connection is very poor for all client. I don’t know or it is interference or just bad router.

Maybe some area interference, try change location, play with channels.

Try connect another iphone 4, same problem.

Iphone 4 latest OS 5.1, MC603LP, 04.12.01, not jailbroken, network Omnitel, but now on Telenor (roaming). MikroTik RouterOS 5.16 (c) 1999-2012 [admin@MikroTik] > interface wireless export compact rt expected end of command (line 1 column 35) [admin@MikroTik] >> interface wireless export # may/17/201...

Signal is very good, iphone is near the router, not more than 2 meters. In registration it just disappear... Here is debug log: --------------------------------------------------------------------------- MikroTik RouterOS 5.16 (c) 1999-2012 http://www.mikrotik.com/ [admin@MikroTik] > log [admin@Mikr...

After update to 5.16, wireless connection between Iphone unstable. Randomly disconnected and impossible to connect again; need to wait 1-5 min. or reboot router. Can somebody to confirm that problem? Log: -----------------------------------------------------------------------------------------------...

I sure it is not power issue, i upgraded latest, and checkout "dial on demand" from PPP tab. Now if 3g signal lost, router not hang any more, but couldnot connect to modem, need to reconnect usb to work again.

Hmm, Yes, it happen frequently when i increase TX power to 25dbm. I shall try to find spec. I found the same problem if i connect with large usb cable to 3g, it always hang instantly, need to reconnect power to bring in working condition. I have maked supout.rif if needed...

Same problem with my RB751G when using 3G modem. But router not hang completely some function disappears, interface table is empty. Reboot, shutdown commands don't work. Only recycle power helped. I notice that problem occur when signal of modem is weak or lost.