Audio Issues

I work with a video editing production company and we use jitsi calls to communicate with our clients because we work remotely. We have been using Jitsi for more than a year now and with the occasional glitch, it seemed to work well for us.
Lately ( About 2 weeks ago) our clients are having a hard time hearing us as we sound over-modulated (we checked our mic levels and they are fine) and our voices come in and out making it hard for them to hear us. Has anyone else had this issue or is there a fix?

Any help would be great!