WNAP320 Disconnects clients frequently

I've got similar problems with my WNDAP360 APs. We bought 16 of them but half the time the clients cannot connect more than a handful of devices despite the "max user" level of 64. Even if I only have 1 client associated, they will suffer disconnections throughout the day. I had to set up an old Linksys unit for that single client and, surprise, they don't get any more disconnects. I've also been "working" with Netgear technicians for a couple weeks, but so far we haven't been able to solve the problem because they keep telling me it works on their end. That doesn't help me. I've been trying to make these access points work for 3 months; I even bought the WC7520 controller, but that only made issues WORSE. I'm ready to ditch Netgear altogether.. This is just ridiculous. Upgrading firmware hasn't helped. Downgrading firmware hasn't helped. Changing from a 16 bit subnet to a 24 bit subnet didn't help. WEP doesn't work at all. The radio on/off scheduler doesn't work unless you keep the Netgear NTP as default. So many issues and no solutions. :confused: