The same thing is happening to me. I bought a wooden 1950 house and we did the foundation repair in December 2020. Now in June 2021 we have been noticing so many bumps and humps in the floor. I don’t know what to do. I’m so frustrated because we put a lot of money in the renovations. The company who did the leveling foundation said that is nothing to do with that that maybe is the vinyl planks but I don’t think so. The floor was flat before and after we put the vinyl planks. It happened 6 months later. What should I do?

It's not clear from your post if the brick is entirely inside or a part of the exterior brick wall. In any case, just covering it up with sheetrock or anything else is likely to accelerate the deterioration. I would definitely consult a company or two or three that specializes in masonry restoration to see what they say. This is not a DIY project and is likely to be expensive, but if the brick is a part of the house's structural support system you really don't have many options.

There should be a number of masonry contractors in the Boston area who specialize in historic restoration and repair. Consulting one or more of them is important. Type of mortar used and other issues need to be considered, including the advisability of installing some sort of interior perimeter drain when the floor is poured. Power washing and interior parging are probably not advisable, but you need expertise on site, not from people who have no way of seeing your walls.

In your area I assume its slab on grade, and they probably ran sleeved copper pipes through the slab. There was apparently some quality control issues in the 90's, since I know several folks that have repaired leaks in these copper pipes. Dry weather does make the ground contract, which means you may get more slab cracks because there may be less support. One simple solution to stabilize the slab is to run water around it in an attempt to keep the ground moist and stop it from contracting - but YMMV. It is possible that a pipe in your slab has developed a small leak, and water is following the plastic/rubber sleeve that is around the pipe. and ending up under flooring or other structures. Another possibility for the bathroom is that they did not properly install the shower pan, or install waterproof underlayment, and water is getting under the tile. Grout is not waterproof, and if grout is wet when there is no visible water source on top, there is water under the tile. Bruce