audio cutting out on select meeting members

I have a recurring meeting of 4 total. I'm in the US, one is from India.

One of the people in the US has slow internet of 7 Mbps.

Randomly, one of the guys will suddenly not be able to talk and has to log off and log back on.

I'm going to try making the meeting a webinar, but what is going on here?

Is there a better way to fix this?