Having similar issue on my Series X since the day before the last update. I load in, but if I start walking around my game might freeze and turn off the console. I have to sit still for a while for a better chance. Can't think of anything game breaking that needs to load in. A large kelp plot, a few furnaces that have been going for a while, maybe a pool of lava I made. No complex builds, farms, or anything.
Not using pistons or any redstone to harvest kelp, all manual. The kelp is spread out over multiple chunks, however. A large area of the water it's contained in I mined out. Could it be the mess of water sources?
Edit: @Branko Šaškovič ~160 mb