Does anyone else lose consciousness when they're switching? Anyone ever stop breathing?

Quite often there is "dead air" between Jonathan's leaving and Jon's "taking charge" where he just goes limp. That can get kinda scary, but usually it's only a second or less. Jonathan will usually tell me to hold him so that he doesn't get hurt when he passes out. It's just unnerving to hold my lover's unconscious body, waiting for someone to show up...
And yesterday it got worse. He stopped breathing. He stopped breathing during three separate switches (He's still speed switching). He's really freaked out by it, and I am too. The last time, I ended up giving him mouth to mouth because it was taking too long. Maybe I'm just impatient, but I was really scared!

Does that happen for anyone here?
Or is this something different we should worry about?
Still no insurance, still no T, still no pdoc.
I hate to keep bothering you guys. I know you can't tell me anything about what's going on with him because you aren't him. I just don't know where to talk about this. Thanks for being so kind.