Hi there! Sorry to hear you are having issues! We believe that these are ISP network issues, and that Figma is particularly susceptible to these issues because we use long-lived connections. We suggest reaching out to your ISP as other customers have reported that their ISP was able to fix the problem.
Our Tech quality team has been working with engineering to address this — we’d appreciate it if anyone who is experiencing this would fill out this form so we can grab some additional data: here
To protect your privacy, please do not post any personal info in response to this.