Lennox Compressor Cutting Out

My 10-year old, 5-ton Lennox A/C system started giving me problems recently. For some time, we have heard a gurgling sound coming from the attic (where the evaporator/blower is). The sound kept getting louder and longer. Finally, a couple of weeks ago, the compressor started overheating and shutting off in mid-cycle; I also noticed the connections to the outside unit icing up. A repair man came out and replaced the expansion valve, which seemed to help for a few days, but now the compressor is occasionally shutting off in mid-cycle again, and I have noticed ice buildup outside. Is there anything else that could be causing the problem? Thanks.
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jsherman wrote:

That is only a guess, we can not diagnosis problems from here! I am NOT responsible for what you & your tech do. There is a problem that needs to be addressed! Read all, you can & get you tech to do the same! If he uses all of the diagnostic tests available, he will locate the problem(s)! - udarrell
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Air Conditioning\'s Affordable Path to the "Human Comfort Zone Goal"
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wrote:

You need to have the same guy come out. He needs to change the expansion valve again. Those go bad pretty often and once in a while they get a bad batch of them. That should take care of it. Be prepared to pay for it again though. Its not his fault the valve went bad. Bubba
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"I also noticed the connections to the outside unit icing up. " It sounds and looks like overcharge to me and possible not enough air across cooling coil DIDO
A repair man came out and

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