I only have special characters in my 5ghz SSIDs. My 2.4ghz SSID is only letters and numbers. I too have a 3200 and had all the problems described here and elsewhere. I was on 384.5 and still had the problems so I took the advise of others here and went back to 384.3 with a factory reset. I have...
I also have a 3200 and have tried everything that has been suggested on these and other forums. I rolled back my firmware to Merlin 384.3 and have not had any problems with 2.4ghz for over a month.