Likely crashes are the result of memory overuse. How much RAM do you have and which version of FTM 2014 are you using, 32 bit or 64? Although not admitted to by Ancestry, if your file is several thousand people you will need 8 GB RAM minimum with the 64 bit version. I don't use FTM 2014 for this reason. I don't have enough memory and can't afford another computer right now.
By the way this isn't an unusual occurrence. Similar threads stretch back several versions of FTM. Luckily, as you've noticed (and Silverfox, too), it's mostly irritating and not a data loss issue.