Skype not functioning on new iMac

I bought a new 27" iMac a couple of months ago. OS is High Sierra v10.13.6. Wireless keyboard and mouse. Skype version is 8.32.0.44. Other than Skype, I have had no other issues with existing software.

Ever since I've had this computer I am having issues with Skype. When I attempt to talk on Skype the other person's voice continually cuts out making it impossible to have a conversation. I do not use video and the problem exists whether the other person uses video or not.

Anyone else experienced this? Could there be interference from the wireless keyboard and/or mouse? I am at a loss as to what I should be looking at. My searches have turned up too many dead ends.

 

Thanks for your reply. I've always used the LAN cable for this new iMac and the old one. I have 32GB RAM and I had already closed all programs based on things I read elsewhere. My router/modem setup hasn't changed. My old iMac had only 4GB RAM and it didn't have this problem.

I discovered that my Skype audio/video settings weren't explicitly set as Plantronics headphone/mic so I changed those and did the Echo Sound test a couple of times and everything was clear. However, that test is only testing me talking and not someone talking to me so I doubt that is going to change anything. Until I speak with someone I won't know if there is a difference. From what I'm told, my voice isn't cutting out. Only the voice of the person I'm talking to does. This has occurred with multiple people so that indicates the problem is on my side. Also, they've stated that I'm the only one they have the problem with.