Is it affecting you? Typically hard are these sessions? If its intense, fast its fine. But if you feel headaches all the time, have memory issues a week down, then thats a problem.
Everyone handles concussions differently, some can shake it off and continue, others have to hang up the gloves. I'm lucky so far to not have had any despite competing, but a 2 of my teammates have and had to quit the sport for good.
You sound somewhat new to the sport. The way it works is that sparring is where you practice stuff you've been practicing and drilling all week in a live environment; Be it techniques, tactics, etc. The actual fights are saved for well.. the fights themselves. You're going to get brain trauma regardless so its best to have it chipped away where its supposed to be. Whether you're a rocket scientist, or laborer, when upstairs is ruined, you're done. Its like dipping your electronics into water.
Keep the sparring intense, don't drop the speed, but do drop the power. This goes for your partners as well. Real hard sparring has its place, I recommend at most 2-4x in a camp.