Ahh!! The SRAM chains are on the weaker side I feel. I ride all SRAM except my chain and cassette. I ride a Shimano chain because I feel they are stronger! I also ride a Shimano rear cassette but only because SRAM does not make an 11-21:-(

That must of been frustrating! I am always so frustrated when a training ride turns into a ride of mechanicals and nothing gets done, I always feel dissapointed for some reason.

Glad you got home safely and figured out the problem