Yes it happens.  I save often if I have to search.   Per support:

 
You can revert to the old code editor which should
prevent Studio from crashing, but there are some inconsistencies with the
intellisense. To revert to the old code editor, comment out the following lines
in the K2Studio.config file:
<!--
<CodeWindowContext1
Assembly="CWTest.dll" Type="CWTest.CodeWindowContext" />
<CodeWindow1
Assembly="CWTest.dll" Type="CWTest.CodeWindow" />
<CodeWindowContext
Assembly="CodeWindowControl.dll"
Type="SourceCode.CodeWindow.CodeWindowControlContext" />
<CodeWindow
Assembly="CodeWindowControl.dll" Ty!
pe="SourceCode.CodeWindow.CodeWindowControl" />
-->