Oh yea, many times in DWC systems. I finally found some really heavy duty 5" net pots that didn't spit open. The smaller 2 and 3 inch net pots split all the time still. You just have to support them as best you can like cravin morehad said above.
I have had this happen, but I really didn't bother to fix it because the roots that where there where good enough to hold it in place still, but I guess it really would depend on how bad/where the broken spots are.
I had some HUGE plants growing in 5.5" netpots. The only thing that I worried about was my home depot lids giving way adn letting the netpot fall thru (it happens on big plants) I end up hanging it with wire hangers bent to my specifications