It's not an actual channel move. WANN has most recently been operating on physical channel 29. That's their assigned channel.
Virtual channel 32 was just their PSIP.
(Just for fun, WABE "channel 30" actually broadcasts on physical channel 21, so neither WANN 29 nor 32 were actually physically near.)
My feeling is somebody at WANN turned off the PSIP data because most or all of the channels now no longer seem to have any PSIP. Not that many of them ever had much to start with but now there's nothing at all. If that happened, the station would suddenly show up as channel 29 for most receivers.
Fwiw, the signal quality should not have changed one bit because only the PSIP seems to have changed. But many trees have fewer leaves now compared to summer, for example. That can make a difference.