What region? EU, US, etc.
Do you guys all have an authenticator attached? (phone or fob)
Do you have SMS Protect enabled?
Are your accounts all on the same battle.net account or across multiple emails?
Are you playing through a proxy? (wtfast counts as a proxy)
Are you using wireless, native ethernet, or USB-to-ethernet adapter?
What ISP and type (cable/dsl/fiber/LAN) are you using?
What OS are you running?
Any antivirus apps installed (aside from Windows Defender if you're Win10)?
Probably more but the above are usually the most relevant in showing some clustering of data points. I'd ask about datacenter/routing but I'm not sure how to figure that out anymore as it's been years since I've had any of those issues.
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