NOT an expert anymore... but own 3 Dells... the "newish" one is probably 2 years old, but the issue you have been having seems a bit familiar to me.
I have some minor surgery later this afternoon, so I'll have time to think on it if no one else posts.
(I ended up revamping the whole system (from router down), a year or so ago an had an IT guy do the installation, but hopefully what he did will be of use to you.)
Quick questions... are you using a cable (RJ-45) connection or to the router / modem or WiFi more exclusively? and How old is the Dell you use most?
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