Is this a Z axis problem on my A1?

I’m very new at this. I printed perfectly fine last week, now I want to throw it out. I have printed several bigger projects without failure.

  • I moved the printer to a different room, but did full calibrations multiple times.
  • I only print PLA, and they are stored airtight, so a significant decrease in quality in 4 days seems odd.
  • I’ve tightened both X-axis and Y-axis because of promts, with no better results.

First layer often does not connect fully to the walls, and there are some areas where I almost can see the plate. It evens out, but also top layers are a bit sparse, and I feel like I can see the sparse infill some places.
Also, the top of the walls often has a “edge” to them (but on all sides, not scewed)

I have not upgraded the firmware, but I have changes nozzles (a brand new 0,4 stainless), and I have tightened everything that can be tightened in the extruder.
Is it the plate? It’s only a month old, but worn out in the wiping area. Can it cause the Z Axis to register too low? Do I need to try a different table? I just want to buy a new A1 at this point, I just want to print THINGS, not tests.

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