I finally received confirmation from TP-Link support that the issue is with the hardware itself. I used to be a big fan of TP-Link, but I'm quite disappointed now. The TP-Link official store where I purchased this camera refused to give me a refund until I contacted TP-Link support. It turns out that the 'official' store is only TP-Link verified, not directly managed by TP-Link, which made the refund process more complicated—similar to dealing with a small seller trying to push you into accepting a faulty product. I'm not sure what's happening with TP-Link. It used to be a reliable brand, but how did their quality control miss this issue? Or is there something else they're not telling us? I don't know.