I don’t have the Q35, as it’s upgrades didn’t benefit me enough to spend double the cost of the Q30 I already owned.
But if I did, and I had this issue, I’d immediately email open ticket with support to flag the issue, if there was no fix, such as a replacement unit which addressed it, or a beta firmware update released to me to test which fixed it, I’d return for full refund and not buy another until I saw the issue was fixed.
This issue however there’s very few owners flagging it up, so the claim it’s all Q35 I have healthy skepticism. I have never had a Soundcore issue they didn’t resolve satisfactorily. I think I’ve replace 7 units of Soundcore products the last 2 years and I always ended up happy with replacements. That drives my skepticism of claims all units have issues. I’d believe early batches did.
Anker (including Soundcore) I have found over a decade has always stood by it’s warranty. Only this last week I had an Anker device fail and I wrote it up clearly with video and pictures and they immediately next day replied saying they shipped a replacement.
So my experience drives my skepticism of all Q35 has an issue. Some is believable, not all.