yes, most likely a power problem. The RPI is not designed to provide full current on its USB ports, because it is USB powered itself.
the "select timeout" and later "no such device" means the JeVois camera went down, and the PI cannot grab video from it anymore as JeVois was dropped from the USB bus.
Yes, please try with the second end of the Y cable going to a wall adapter, or battery pack, etc and you should be fine. See here for more info: