Yep, I sometimes get CTDs while using the FSS in EDO. I minimise them by slowing down my scan rate, waiting for 2-3 sec after each focus before zooming out again. A minor pain, but fairly effective for me at least. I assume it's because my rig is a little creaky : i7-4790.
I get them some days, and other days never, but I am pretty sure it all comes down to how well my internet is working. I have noticed on days when web pages are slow to load that's when it usually happens. I make sure to send the crash report on each occaision though, the more info the devs have the better.