A quick search turns up problems, enough so that, as a consumer, I'd be concerned. Is that hard enough data to reach a conclusion in a major scientific journal? No.

Is it enough data so that, as a consumer looking to purchase one, I would be concerned? Probably.

Is it enough data that I'd expect some engineer at Google (or wherever) to pay attention and address? Certainly, I would expect some engineering team to pay attention to public forums and address issues as they arise. It doesn't seem to be happening. If these phones are supposed to be a flagship items, and I think it's reasonable to claim that they are, it's also reasonable to expect flagship support.