Wow, 10 days before season and my bow was shooting perfect and then.....

Last practice shot of the night and when I let the arrow go it sounded like a 22 went off and my string and harness were limp. Everything is intact and still together, but there is no tension on the limbs and the string/harness is off the wheel and cam. I am shooting a 2002 Hoyt Magnatec with the NT2000 limbs and a single cam, drawing around 65 lbs at 80% letoff. The string and harness are less than a year old and in good shape and the top wheel and cam are as you would expect......nothing is broken and everything appears to be in working order. So I take it to the dealer this morning and start asking questions and he basically tells me "yah it happens" and just kinda blew me off....... I am sorry, but I need a little more information than that. I mean I have to assume that this is not normal, but can I expect it to happen again? Can any of you guys give me some feedback on this problem and any possible preventive measures? I would also like to input on a portable bow press to fix any future problems in the field.

Thanks