Im not sure if its all your textures or just that brick one. If you see a message at the top left in red about going over your streaming budget this usually causes textures to look blurry etc. You just need to use this console command: ‘r.Streaming.PoolSize 5000’ changing the number to the mb you want to allow for streaming textures. Should fix it instantly, but if its a different problem, with that texture only then perhaps show us the material.
If this is from a render, perhaps its happening because of the denoiser.