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When I’ve seen seen any issue like you describe, it has to do with the local network
It wasn’t my network. I used FING and other network diagnostic tools extensively, and sent all screenshots and reports to SGC. We went round and round but I followed all his many troubleshooting suggestions to the letter and they didn’t fix it. All other devices running on my network operated flawlessly during the same time.
I sent the unit back, and whatever he did ( wiping it and reloading everything? or hardware fix?) fixed it and he sent it back within a day. He never told me what the problem was in followup emails, nor with the returned unit.
It’s been working like new (like it did originally for 3 months) for 6 months and I am happy. Hope that continues. It’s a good alternative to the Roon Nucleus, and smaller and less expensive. Cheers, PD