Problems wit one-on-one meeting not with group meetings

Hello Zoomers, hope you can help me. I've been having some strange issues with Zoom for a while now. When I'm in a one-on-one meeting, after a few minutes, my video freezes. Then, after a few more minutes, everything crashes. However, when I'm in a group (8 - 10 people), everything works fine without any problems. Additionally, I'm unable to log in via someone else's link. I've reinstalled everything and cleared my cache, etc. I have no idea what else to do. Can you help me? It's so weird that it works fine with multiple people but not in one-on-one sessions.