We have very recently tested new firmware and it appears to fix the issue. You should be seeing it very soon.
Can we get an update on this firmware update? I haven't been able to backup my laptop in months since getting this POS Pace and am on the verge of switching from Sonic due to the lack of a solution to this problem. (Which is a shame since I've genuinely liked having Sonic's overall service and support.) At least if you could offer an alternate modem until the issue is fixed! It seems insane to only have one option as you're putting all your eggs in that one basket and assuming that there won't be any compatibility issues.
I never had ANY problems with my MyCloud working with my original modem that Sonic provided and then I was sent a "New and improved' Pace when I moved and have had nothing but trouble since. I'm not nearly as tech savvy as most of the posters to this forum so I don't feel confident at all attempting any of the suggested workarounds on my own.