For anyone who might be interested, here’s the issue.
The tablet has very few to zero operating issues. It has worked almost flawlessly for 2.5 years. I regularly charge the battery to only 80% since that has been reported in several different places to maintain optimal battery health over a longer time frame.
There have been periods when I would notice the tablet required many more hours to charge than it had in the past. At these times, I change only the cable, and the problem goes away. I do not change the plug at the outlet. I do nothing to the tablet. It’s just the cable I change. This morning, it took 3 hours to add 10% battery, so I plugged in one of the new cables I just got from Amazon, and it increased an additional 20% within 1 hour. It’s clearly the cable.
For those who are even more curious: it’s a Samsung Galaxy Tab Pro 8.4 inch, WiFi only. It’s a fine machine. I’m very happy with it. Generally, it stays on but asleep 24 hours/day. I have to restart it about once a month to clear up a few issues I may notice.