I reckon the twisting load has worked it loose.
If it's like mine, it's "D" shaped inside the aka tube and can't twist. Mine all have started coming out at some time. I think the Ama hold the ends just a little too good sometimes and pull one out a little, now and again. I tried re-glueing mine a couple of times but they still do it at times. It also may have to do with which end of the ama is released first, as I find sometimes with both bungees off, the aka and ama don't want to slide apart. As long as they dont get too loose, I have just been taping them back in when putting them away after a washing and inspection each trip. If you find something that works, please let us know.
- - - - - Hobie Island Sailing since 2006 - - - - - 2011 & 2015 Hobie AIs and a 2012 TI