Finally got the printer problem resolved. With a Brother tech on the phone, it took about 4 hours. Some things still remain a mystery however. In the past, the printer has always worked on my wifi while my pc was hardwired to the modem. But after having to do a factory reset as a last resort, the printer will only work with both pc & printer having the same IP address. In a way, that seems to make sense, but it had been working for at least a year when using Windows 10 & the earlier setup.

Apparently, (just a hunch) the printer was picking up a ghost signal showing " Receiving Data" on its monitoring screen, till a factory reset resolved it. When it was on my wifi, I was able to access the printer anywhere in the house. Now, I'm not so sure. Anyway, thanks to all for your input. Appreciated !!