Security cameras can be blurry because the lens might be out of focus the lens may be dirty water droplets on the glass dome are causing the light to reflect back into the lens the cameras image sensor is defective or the camera might be a low resolution camera which will look blurry compared to other high definition cameras.
My security camera is fuzzy at night.
Check the security ip camera lens for dirt dust spiderwebs etc.
For example in summer there may be condensation in the morning on the outside of the camera lens.
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Long extension cables make it difficult for the signal to pass properly sometimes.
If it it cloudy.
When dealing with the security camera blurry at night problem the solution can be as easy as clean the camera dome glass or more complex as a bad camera or lens.
The light coming from infrared leds in the camera gets reflected back to the camera which causes noise and blur in the night view.
Clean the lens with a soft and clean cloth.
The extension cable run may be too long.
To solve the problem just start simply by removing the camera dome at night time if possible to observe if the glass is causing the blurry or foggy effect.
Do not use harsh cleaners or aerosol cleaners that may harm the lens.
When condensation forms on a security camera it can blur lenses and compromise image quality.
Also all data transmission of this system is done via ethernet cables simple and stable.
For example mirrors windows and objects made of glass.
I would test each one in day night and with different cables and connectors so that you can narrow down what the exact problem is.
Condensation occurs on the warm side of the glass.
That means taking all the cameras off line and working on them one at at time.
Security cameras night vision can get blurry due to reflective objects in the camera field of view.
The infrared cut removal.
If the security camera feed is fuzzy and not clear then another reason behind this could be an extra long extension cable run.
Part of the problem sounds like it could be a power issues with the cameras not getting enough power.