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You can test this by turning off Windows FW. This has worked for some users even though AIS and Win FW are compatible.
You can also submit a mini-dump file when you are actually having the problem.
Here is additional information on how to invoke a memory dump file: http://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=71.
Please, zip and upload the C:\Windows\Memory.dmp file to this anonymous ftp server and name it uniquely: ftp.avast.com/incoming. Avast will analyze it and respond back to you in this thread or to your email.