If it happens again, make a not of when it happened, time and date and following that ensure that any minidump file relates to that time.
Then you could upload these to avast for analysis. The process would be one of first compressing any corresponding minidump files into a zip file, giving it a unique name like TBF20-minidump.zip, etc.
I would also advise creating a readme.txt file using notepad and place that in the TBF20-minidump.zip file. This should contain the background information (basically a copy and past of your first couple of posts), a link to this topic, forum user name and email address, etc.
This gets uploaded to
ftp://ftp.avast.com/incoming - Using Internet Explorer, Connect to the link and drag the file into the Right pane and drop it, that starts the upload, you don't have read access to this folder.
Or
How to upload it using the Run command-line in Windows: Windows Key + R (to get the run box), copy and paste this
explorer ftp://ftp.avast.com/incoming
and drag the zip file into the window, from another explorer window.