The Looking Glass isn’t showing any drops, but I did receive feedback from the staff that the 100% ping loss may be due to your Wireless configuration ignoring the packets being sent to it. There’s nothing you can do to change that, and you likely don’t need to worry about it.
I think I missed this line on the first read, as there was a lot of information to process. If the wired connection is fine, and things get worse when you switch to wireless, then you’ve already figured out your problem. This type of interference can be caused by new devices on networks (even in homes next door to you), a new microwave, smart devices, smart assistants like Alexa or Google, or just degradation of the wireless capabilities of the network. Sometimes wireless cards go bad in computers, sometimes routers or modems go bad and need replacing. Nothing lasts forever.
It’s not that simple for some cases. Sometimes the peering partner in the middle (not their ISP and not Blizzard) is causing a problem and this test may help point that out.
Well, I tried. Troubleshooting does require patience 
Blizzard staff read some threads, but not all. If you’re seeking an official response from them, you may need to use their ticket system.