Wow! I never thought I would find another Amigan using the ClearSpot 4G+!
My A1200 crashes in just the same way yours does. It connects, then, just about immediately crashes. You don't have any problems connecting on wi-fi with any other device, do you?
I was told by my former neighbor who, like you and me experience spotty WiMax service with our ClearSpot 4G+, that he spoke to tech support at Clear and they told him that when the weather is poor, like when it's raining, that their WiMax signal weakens. Have you observed this, too?
I've also tried every WEP setting, in addition to no WEP - an open wi-fi connection, but I wouldn't advise leaving an open wi-fi connection for any real length of time. I just did it to determine if using WEP was a problem or not. Apparently, WEP or no WEP has no bearing on this problem.