@twack,.
I hooked up two additional powerstrips last night, strip #1 at ~2 feet from the router, strip #2 at ~20 feet from the router, and then the original strip (#3) hooked up in the bedroom at ~40 feet away through wood/concrete. Strips 1 & 2 were both still on this morning, while strip #3 was off. It looks like @ronnycarr 's findings match up with mine. Thanks for your input, Ronny. It would’ve taken me a bit to discover that as being the issue.