Why is my Android system using so much battery suddenly?

from last 2 days, my battery is draining too fast. android system is using 41% of battery. I use power saving mode always. I don't turn on location. I use ultra power saving mode during night. but still full battery charge lasts only for 16-18 hrs. I noticed that my WiFi keeps disconnecting frequently. could that be the reason? but otherwise, is anyone having same problem with android system's battery usage?

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