Occasional problems with the conference

2 weeks ago some problems with the conference began. My home Wi-Fi often doesn't allow me to see or hear participants. And participants can't see or hear me. I have to distribute the mobile Internet from my mobile phone. Sometimes everything is fine, sometimes it's bad. And it's not just me. I live in Russia, and many students have the same problem. The provider says that there are no problems on their side, no restrictions. Perhaps Zoom itself did something and the difficulties appeared. Please tell me what the problem could be. Speed of my router is good.