My CEREC crown chipped very big on my tooth number 18 with it only being in for 24 hours. Is this normal for a CEREC to break?

My crown was barely in for 24 hours and broke. I didn't realize I was getting a CEREC crown and actually thought my crown would be done the old way, through a lab. I feel now that I don't have any confidence in either my dentist nor CEREC crown, being that this chunk fell off so soon, while eating a soft egg sandwhich. The crown also did NOT fit well at first and felt very high so he kept drilling or filling it to fix it, could this have compromised the quality?