Student keeps getting kicked out of the meeting

[Aket]

I'm an online teacher, and I use a paid Zoom account for my classes. One of my classes has three students: A, B, and C. Every time students A and C are in the meeting together, student A gets randomly kicked out—whether it's just the two of them or all three students together.

At first, I thought it was an internet connection issue because sometimes the student returns to the meeting almost immediately without having to go through the waiting room. However, lately, she hasn't been able to rejoin the session at all, and I can't call her back (she says she doesn’t receive the call). The odd thing is that I’ve had full classes with student A alone and with students A and B without any issues, even immediately before student C joins the meeting, as well as after student C has logged out.